Re: [PHP] Constants in strings
On 06/07/11 17:33, Robert Williams wrote: Where I've made most use of heredocs is when I want to do nothing but define a bunch of long strings in one file. I find the most useful thing about heredocs is that they don't care about quotation marks, so I often use them for SQL statements where I might have a mixture of ' and eg. $sql =EoSQL SELECT foo AS Foo FROM Bar WHERE baz='quux' EoSQL; -- Peter Ford, Developer phone: 01580 89 fax: 01580 893399 Justcroft International Ltd. www.justcroft.com Justcroft House, High Street, Staplehurst, Kent TN12 0AH United Kingdom Registered in England and Wales: 2297906 Registered office: Stag Gates House, 63/64 The Avenue, Southampton SO17 1XS -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Constants in strings
Hi all,
OK. We all know that constants cannot be accessed directly via their name
in double-quoted or heredoc strings. I knew this already but a read of
the PHP manual got me thinking.
The manual states that to get the $$ value of a variable, the form
{${var}} should be used. Therefore, I wondered if something similar
would work for constants.
Attempt 1 (just to be sure):
?php
define ('XYZ','ABC');
echo {XYZ}\n;
?
Output - {XYZ}
Attempt 2:
?php
define ('XYZ','ABC');
echo {{XYZ}}\n;
?
Output - {{XYZ}}
No luck there. I did encounter one oddity though:
?php
define ('XYZ','ABC');
echo {${XYZ}}\n;
?
Output:
PHP Notice: Undefined variable: ABC in /home/wilsond/testScripts/l7.php
on line 3
Which appears to mean that PHP is able to pick up the value of the
constant and try to access a variable with that name.
Any ideas?
Cheers
Dave
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Re: [PHP] Constants in strings
On 7/6/2011 7:07 AM, Dave Wilson wrote:
Output - {XYZ}
Attempt 2:
?php
define ('XYZ','ABC');
echo {{XYZ}}\n;
?
Output - {{XYZ}}
No luck there. I did encounter one oddity though:
?php
define ('XYZ','ABC');
echo {${XYZ}}\n;
?
Output:
PHP Notice: Undefined variable: ABC in /home/wilsond/testScripts/l7.php
on line 3
Which appears to mean that PHP is able to pick up the value of the
constant and try to access a variable with that name.
Any ideas?
echo XYZ . \n;
--Curtis
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Re: [PHP] Constants in strings
On Wed, Jul 6, 2011 at 12:07 PM, Dave Wilson dai_bac...@hotmail.com wrote:
Hi all,
OK. We all know that constants cannot be accessed directly via their name
in double-quoted or heredoc strings. I knew this already but a read of
the PHP manual got me thinking.
The manual states that to get the $$ value of a variable, the form
{${var}} should be used. Therefore, I wondered if something similar
would work for constants.
Attempt 1 (just to be sure):
?php
define ('XYZ','ABC');
echo {XYZ}\n;
?
Output - {XYZ}
Attempt 2:
?php
define ('XYZ','ABC');
echo {{XYZ}}\n;
?
Output - {{XYZ}}
No luck there. I did encounter one oddity though:
?php
define ('XYZ','ABC');
echo {${XYZ}}\n;
?
Output:
PHP Notice: Undefined variable: ABC in /home/wilsond/testScripts/l7.php
on line 3
Which appears to mean that PHP is able to pick up the value of the
constant and try to access a variable with that name.
Any ideas?
My guess is that the preceding $ causes PHP to interpret the next token
{XYZ} as a variable or a constant, but without that preceding $ it has no
way to know you're trying to use a constant. As Curtis points out, the only
way to insert a constant into a string is through concatenation.
-Stuart
--
Stuart Dallas
3ft9 Ltd
http://3ft9.com/
Re: [PHP] Constants in strings
Any ideas? echo XYZ . \n; --Curtis -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php Which doesn't answer the original question Dave asked... Thanks, Ash http://www.ashleysheridan.co.uk -- Sent from my Android phone with K-9 Mail. Please excuse my brevity. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Constants in strings
On Wed, 06 Jul 2011 12:56:21 +0100, Stuart Dallas wrote:
My guess is that the preceding $ causes PHP to interpret the next token
{XYZ} as a variable or a constant, but without that preceding $ it has
no way to know you're trying to use a constant. As Curtis points out,
the only way to insert a constant into a string is through
concatenation.
-Stuart
OK. I should have made myself clearer - I was making an observation with
regards to constant parsing in strings rather than looking for advice. My
bad.
My third example showed that {${XYZ}} would echo the value of the
variable called the value of XYZ:
?php
define ('XYZ','ABC');
$ABC=huh!;
echo {${XYZ}}\n;
?
Output - huh!
We could easily re-write the 'echo' line above to be:
echo {${constant('XYZ'}}\n;
But my example shows that PHP *is* accessing the value of a constant
without any jiggery-pokery or hacks (e.g. http://www.php.net/manual/en/
language.types.string.php#91628) as it is retrieving the value of ABC
from the XYZ constant and then looking for a variable of that name.
I admit that I'm no C coder but it may be possible (note, the word may)
that a change of code within the PHP source tree will allow us to use
something like echo {{XYZ}} to access the constant value.
Cheers
Dave
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RE: [PHP] Constants in strings
-Original Message-
From: Dave Wilson [mailto:dai_bac...@hotmail.com]
Sent: Wednesday, July 06, 2011 10:11 AM
To: php-general@lists.php.net
Subject: Re: [PHP] Constants in strings
On Wed, 06 Jul 2011 12:56:21 +0100, Stuart Dallas wrote:
My guess is that the preceding $ causes PHP to interpret the next
token
{XYZ} as a variable or a constant, but without that preceding $ it
has
no way to know you're trying to use a constant. As Curtis points out,
the only way to insert a constant into a string is through
concatenation.
-Stuart
OK. I should have made myself clearer - I was making an observation
with
regards to constant parsing in strings rather than looking for advice.
My
bad.
My third example showed that {${XYZ}} would echo the value of the
variable called the value of XYZ:
?php
define ('XYZ','ABC');
$ABC=huh!;
echo {${XYZ}}\n;
?
Output - huh!
We could easily re-write the 'echo' line above to be:
echo {${constant('XYZ'}}\n;
But my example shows that PHP *is* accessing the value of a constant
without any jiggery-pokery or hacks (e.g. http://www.php.net/manual/en/
language.types.string.php#91628) as it is retrieving the value of ABC
from the XYZ constant and then looking for a variable of that name.
I admit that I'm no C coder but it may be possible (note, the word
may)
that a change of code within the PHP source tree will allow us to use
something like echo {{XYZ}} to access the constant value.
Cheers
Dave
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define('DIR_JAVA', '/js/');
When you need to use the JavaScript directory you can do this.
script src=?php echo DIR_JAVA . 'jquery-1.5.1.js';?/script
There is no true need for the curly brackets to echo out the value of the
constant.
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RE: [PHP] Constants in strings
define('DIR_JAVA', '/js/');
When you need to use the JavaScript directory you can do this.
script src=?php echo DIR_JAVA . 'jquery-1.5.1.js';?/script
There is no true need for the curly brackets to echo out the value of
the constant.
Except for when you're using heredoc, much like in the OPs first post...
Thanks,
Ash
http://www.ashleysheridan.co.uk
--
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RE: [PHP] Constants in strings
Yeah, that was my answer and I was rebuked for that.
ad...@buskirkgraphics.com wrote:
-Original
Message-
From: Dave Wilson
[mailto:dai_bac...@hotmail.com]
Sent: Wednesday, July 06,
2011 10:11 AM
To: php-general@lists.php.net
Subject: Re: [PHP] Constants in strings
On
Wed, 06 Jul 2011 12:56:21 +0100, Stuart Dallas wrote:
My guess is that the preceding $ causes PHP to interpret the next
token
{XYZ} as a variable or a
constant, but without that preceding $ it
has
no way to know you're trying to use a constant. As Curtis points
out,
the only way to insert a constant into a string is
through
concatenation.
-Stuart
OK. I should have made myself
clearer - I was making an observation
with
regards to constant parsing in strings rather than looking for advice.
My
bad.
My third
example showed that {${XYZ}} would echo the value of the
variable called the value of XYZ:
?php
define ('XYZ','ABC');
$ABC=huh!;
echo
{${XYZ}}\n;
?
Output - huh!
We could easily re-write the 'echo' line above to
be:
echo {${constant('XYZ'}}\n;
But my example shows that PHP *is* accessing the value of a
constant
without any jiggery-pokery or hacks (e.g.
http://www.php.net/manual/en/
language.types.string.php#91628) as it is retrieving the value of ABC
from the XYZ constant and then looking for a variable of that
name.
I admit that I'm no C coder but it may
be possible (note, the word
may)
that a change of code within the PHP source tree will allow us to use
something like echo {{XYZ}} to access the constant
value.
Cheers
Dave
--
PHP
General Mailing List (http://www.php.net/)
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visit: http://www.php.net/unsub.php
define('DIR_JAVA', '/js/');
When you need to
use the JavaScript directory you can do this.
script
src=?php echo DIR_JAVA .
'jquery-1.5.1.js';?/script
There is no true need for the curly brackets to echo out the value of
the
constant.
--
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RE: [PHP] Constants in strings
-Original Message-
From: Ashley Sheridan [mailto:a...@ashleysheridan.co.uk]
Sent: Wednesday, July 06, 2011 10:49 AM
To: ad...@buskirkgraphics.com; 'Dave Wilson'; php-general@lists.php.net
Subject: RE: [PHP] Constants in strings
define('DIR_JAVA', '/js/');
When you need to use the JavaScript directory you can do this.
script src=?php echo DIR_JAVA . 'jquery-1.5.1.js';?/script
There is no true need for the curly brackets to echo out the value of
the constant.
Except for when you're using heredoc, much like in the OPs first
post...
Thanks,
Ash
http://www.ashleysheridan.co.uk
--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.
Ash,
I have a few questions.
I use constants in my OOP and I never use the heredoc syntax. Now I am fearing
that I have not taken advantage of something.
My understanding of heredoc syntax as of 5.3 is just a string quoting right?
Is there an advantage of using the heredoc syntax over single quoted or double
quoted?
Examples:
Echo 'your constant for the javascript path is '.DIR_JAVA;
Echo EOT
Your constant for the JavaScript path is {{DIR_JAVA}}
EOT;
I fully understand the syntax but I do not understand the advantages of using
either.
Is it just a writing style, or is there an advantage to the way it processes,
speed or something?
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Re: [PHP] Constants in strings
On 2011-07-6 08:09, ad...@buskirkgraphics.com ad...@buskirkgraphics.com wrote: I use constants in my OOP and I never use the heredoc syntax. Now I am fearing that I have not taken advantage of something. My understanding of heredoc syntax as of 5.3 is just a string quoting right? Is there an advantage of using the heredoc syntax over single quoted or double quoted? I don't believe that a heredoc will perform significantly differently than a double-quoted string, as, from the parser's POV, they're essentially the same thing once you get past the step of extracting the entire string from the source. I've not verified this by reviewing the relevant source, however, nor have I benchmarked it. But, I'm willing to bit that even if there is a difference, it's so small that you're better off worrying about which will lead to easier code maintenance than worrying about performance (as is typically the case with such micro-optimization choices). In my view, what's important is how you use them. In particular, a heredoc can present a bit more cleanly when you're dealing with a large-ish chunk of text, as in, say, an e-mail message template. The main downside is that they will usually make a mess of code formatting, since the closing delimiter must be against the left margin. For this reason, I tend to prefer multi-line double-quoted strings over heredocs when I have meaningful indentation, as in a function or class method. Where I've made most use of heredocs is when I want to do nothing but define a bunch of long strings in one file. For example, I might create a file to define a set of related e-mail message templates: ?php $accountCreationSuccessfulMessage = EndSuccess Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis. EndSuccess $accountCreationFailedMessage = EndFailure Donec placerat. Nullam nibh dolor, blandit sed, fermentum id, imperdiet sit amet, neque. Nam mollis ultrices justo. Sed tempor. Sed vitae tellus. Etiam sem arcu, eleifend sit amet, gravida eget, porta at, wisi. Nam non lacus vitae ipsum viverra pretium. Phasellus massa. Fusce magna sem, gravida in, feugiat ac, molestie eget, wisi. Fusce consectetuer luctus ipsum. Vestibulum nunc. Suspendisse dignissim adipiscing libero. Integer leo. Sed pharetra ligula a dui. Quisque ipsum nibh, ullamcorper eget, pulvinar sed, posuere vitae, nulla. Sed varius nibh ut lacus. Curabitur fringilla. Nunc est ipsum, pretium quis, dapibus sed, varius non, lectus. Proin a quam. Praesent lacinia, eros quis aliquam porttitor, urna lacus volutpat urna, ut fermentum neque mi egestas dolor. EndFailure ? Of course, this is arguably as clean: ?php $accountCreationSuccessfulMessage = Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis. ; //$accountCreationSuccessfulMessage $accountCreationFailedMessage = Donec placerat. Nullam nibh dolor, blandit sed, fermentum id, imperdiet sit amet, neque. Nam mollis ultrices justo. Sed tempor. Sed vitae tellus. Etiam sem arcu, eleifend sit amet, gravida eget, porta at, wisi. Nam non lacus vitae ipsum viverra pretium. Phasellus massa. Fusce magna sem, gravida in, feugiat ac, molestie eget, wisi. Fusce consectetuer luctus ipsum. Vestibulum nunc. Suspendisse dignissim adipiscing libero. Integer leo. Sed pharetra ligula a dui. Quisque ipsum nibh, ullamcorper eget, pulvinar sed, posuere vitae, nulla. Sed varius nibh ut lacus. Curabitur fringilla. Nunc est ipsum, pretium quis, dapibus sed, varius non, lectus. Proin a quam. Praesent lacinia, eros quis aliquam porttitor, urna lacus volutpat urna, ut fermentum neque mi egestas dolor. ; //$accountCreationFailedMessage ? With the latter, there is the catch that you end up with leading and trailing line breaks, but those are easy enough to deal with, if desired. As to the original topic of this thread, it's long annoyed me that there's no easy way to use constants with interpolation. Since I find repeated concatenation extremely ugly and prone to
Re: [PHP] Constants in strings
I LOVE the heredocs tool. I only learned about it a couple of months ago - what a find! It makes generating my html for my web pages so much easier and allows me to include my php vars within the html with much less confusion and simplifies the intermixing of html and php vars - no more single quote, double quote and dot stuff in an html tag. Sure you have to put the closing tag in column 1 - a mere blip against the pros. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Constants in strings
On 11-07-06 02:59 PM, Jim Giner wrote: I LOVE the heredocs tool. I only learned about it a couple of months ago - what a find! It makes generating my html for my web pages so much easier and allows me to include my php vars within the html with much less confusion and simplifies the intermixing of html and php vars - no more single quote, double quote and dot stuff in an html tag. Sure you have to put the closing tag in column 1 - a mere blip against the pros. With respect to putting the closing tag in column 1... I've found the following to be fairly unobtrusive: ?php $blah = _ Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. _; ? Cheers, Rob. -- E-Mail Disclaimer: Information contained in this message and any attached documents is considered confidential and legally protected. This message is intended solely for the addressee(s). Disclosure, copying, and distribution are prohibited unless authorized. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] constants STDOUT, STDERR, STDIN not working in 5.2.x?
Hello, dan...@daniel-laptop:~$ php test.php /dev/null Error 1 Error 2 dan...@daniel-laptop:~$ ./src/php-5.2.12/sapi/cli/php test.php /dev/null Error 1 Error 2 well, using php-cli instead of php-cgi, this finally worked: ? fwrite(STDERR, test\n); fclose(STDERR); ? But why doesn't it work with php-cgi? That's a binary that is called with the php-file is parameter the same way as php-cli. So both come with STDIN/STDOUT/STDERR contrary to scripts running through mod_php. What is the real difference between php-cli and php-cgi? This fclose(STDERR); is really important for one customer, because this is seems to be the only way to suppress later output to STDERR in the same script by external commands and functions that are too hard to change. But I don't want to break things for all other customers just to make one happier. Can the STDERR constands be enable somehow at compile-time for php-cgi? Regards Marten -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] constants STDOUT, STDERR, STDIN not working in 5.2.x?
On Wed, Mar 24, 2010 at 14:12, Marten Lehmann lehm...@cnm.de wrote: Hello, dan...@daniel-laptop:~$ php test.php /dev/null Error 1 Error 2 dan...@daniel-laptop:~$ ./src/php-5.2.12/sapi/cli/php test.php /dev/null Error 1 Error 2 well, using php-cli instead of php-cgi, this finally worked: ? fwrite(STDERR, test\n); fclose(STDERR); ? But why doesn't it work with php-cgi? That's a binary that is called with the php-file is parameter the same way as php-cli. So both come with STDIN/STDOUT/STDERR contrary to scripts running through mod_php. What is the real difference between php-cli and php-cgi? This fclose(STDERR); is really important for one customer, because this is seems to be the only way to suppress later output to STDERR in the same script by external commands and functions that are too hard to change. But I don't want to break things for all other customers just to make one happier. Can the STDERR constands be enable somehow at compile-time for php-cgi? Regards Marten You can see how the CLI SAPI differs from the other SAPIs here: http://php.net/manual/en/features.commandline.differences.php -- Daniel Egeberg -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] constants STDOUT, STDERR, STDIN not working in 5.2.x?
2010/3/24 Marten Lehmann lehm...@cnm.de
Hello,
dan...@daniel-laptop:~$ php test.php /dev/null
Error 1
Error 2
dan...@daniel-laptop:~$ ./src/php-5.2.12/sapi/cli/php test.php
/dev/null
Error 1
Error 2
well, using php-cli instead of php-cgi, this finally worked:
?
fwrite(STDERR, test\n);
fclose(STDERR);
?
Weird, this does not work with the Ubuntu Version I'm using.
As reported in my previous email, I only can print out to STDERR when I
properly use php://stderr with fopen() - no matter if I use read or write
mode in fopen(). So be cautious when developing for different systems. Here
are some examples:
*** WORKS:
$ php
?php $x = fopen('php://stderr', 'w'); fwrite($x, 'Foo'); fclose($x); ?
Foo
*** FAILURE:
##
$ php
?
fwrite(STDERR, test);
?
Warning: fwrite(): supplied argument is not a valid stream resource in
/home/user/- on line 2
###
$ php
?php $x = fopen('php://stderr', 'w'); fwrite($x, 'Foo');
fwrite(STDERR, 'Bar');
fclose($x); ?
Foo
Warning: fwrite(): supplied argument is not a valid stream resource in
/home/user/- on line 2
###
$ php
?php $x = fopen(STDERR, 'w'); fwrite($x, 'Foo'); fclose($x); ?
// Nothing happens, no warning, no error and no Foo
But why doesn't it work with php-cgi? That's a binary that is called with
the php-file is parameter the same way as php-cli. So both come with
STDIN/STDOUT/STDERR contrary to scripts running through mod_php.
What is the real difference between php-cli and php-cgi? This
fclose(STDERR); is really important for one customer, because this is
seems to be the only way to suppress later output to STDERR in the same
script by external commands and functions that are too hard to change. But I
don't want to break things for all other customers just to make one happier.
Well, see this..
$ php
? var_dump(STDERR); ?
string(6) STDERR
:-(
Can the STDERR constands be enable somehow at compile-time for php-cgi?
Regards
Marten
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[PHP] constants STDOUT, STDERR, STDIN not working in 5.2.x?
Hello, I found different code examples like this, which use the file handle STDERR just like this: ?php fwrite(STDERR, hello\n); ? Also, the PHP documentation of input/output streams (http://php.net/manual/de/wrappers.php.php) says: It is recommended that you simply use the constants STDIN, STDOUT and STDERR instead of manually opening streams using these wrappers. I don't want to use the php://stderr wrapper, because this just creates a duplicate of the original STDERR handler and if I'm closing php://stderr, the original STDERR still would exist. When I'm using this code, I only get: bNotice/b: Use of undefined constant STDERR - assumed 'STDERR' in b/test.php/b on line b4/bbr / br / bWarning/b: fwrite(): supplied argument is not a valid stream resource in b/test.php/b on line b4/bbr / How can I access the original STDERR handle? The constant should be there, but does not exist. regards Marten -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] constants STDOUT, STDERR, STDIN not working in 5.2.x?
2010/3/23 Marten Lehmann lehm...@cnm.de
Hello,
I found different code examples like this, which use the file handle STDERR
just like this:
?php
fwrite(STDERR, hello\n);
?
Also, the PHP documentation of input/output streams (
http://php.net/manual/de/wrappers.php.php) says:
It is recommended that you simply use the constants STDIN, STDOUT and
STDERR instead of manually opening streams using these wrappers.
I don't want to use the php://stderr wrapper, because this just creates a
duplicate of the original STDERR handler and if I'm closing php://stderr,
the original STDERR still would exist.
When I'm using this code, I only get:
bNotice/b: Use of undefined constant STDERR - assumed 'STDERR' in
b/test.php/b on line b4/bbr /
br /
bWarning/b: fwrite(): supplied argument is not a valid stream resource
in b/test.php/b on line b4/bbr /
How can I access the original STDERR handle? The constant should be there,
but does not exist.
regards
Marten
Hi,
I can reproduce it with some differences. Check this out:
$ php --version
PHP 5.2.10-2ubuntu6.4 with Suhosin-Patch 0.9.7 (cli) (built: Jan 6 2010
22:56:44)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies
$ php 1/dev/null # note that the PHP error messages are
displayed on STDOUT - I don't show them with 1/dev/null
?
$x = fopen('php://stderr', 'r'); fwrite($x, test\n); fclose($x);
$x = fopen(STDERR, 'r'); fwrite($x, test2\n); fclose($x); ?
?
fwrite(STDERR, test3\n);
fwrite ('php://stderr', test4);
?
---
Result:
test
So my assumption is, that the quoted recommendation is outdated / wrong.
Regards
PS: PHP reports this when giving the constant STDERR:
Warning: fopen(STDERR): failed to open stream: No such file or directory
Warning: fwrite(): supplied argument is not a valid stream resource
Re: [PHP] constants STDOUT, STDERR, STDIN not working in 5.2.x?
On Tue, Mar 23, 2010 at 11:47, Marten Lehmann lehm...@cnm.de wrote: Hello, I found different code examples like this, which use the file handle STDERR just like this: ?php fwrite(STDERR, hello\n); ? Also, the PHP documentation of input/output streams (http://php.net/manual/de/wrappers.php.php) says: It is recommended that you simply use the constants STDIN, STDOUT and STDERR instead of manually opening streams using these wrappers. I don't want to use the php://stderr wrapper, because this just creates a duplicate of the original STDERR handler and if I'm closing php://stderr, the original STDERR still would exist. When I'm using this code, I only get: bNotice/b: Use of undefined constant STDERR - assumed 'STDERR' in b/test.php/b on line b4/bbr / br / bWarning/b: fwrite(): supplied argument is not a valid stream resource in b/test.php/b on line b4/bbr / How can I access the original STDERR handle? The constant should be there, but does not exist. regards Marten These I/O streams are only present in the CLI SAPI. -- Daniel Egeberg -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] constants STDOUT, STDERR, STDIN not working in 5.2.x?
2010/3/23 Daniel Egeberg degeb...@php.net On Tue, Mar 23, 2010 at 11:47, Marten Lehmann lehm...@cnm.de wrote: Hello, I found different code examples like this, which use the file handle STDERR just like this: ?php fwrite(STDERR, hello\n); ? Also, the PHP documentation of input/output streams (http://php.net/manual/de/wrappers.php.php) says: It is recommended that you simply use the constants STDIN, STDOUT and STDERR instead of manually opening streams using these wrappers. I don't want to use the php://stderr wrapper, because this just creates a duplicate of the original STDERR handler and if I'm closing php://stderr, the original STDERR still would exist. When I'm using this code, I only get: bNotice/b: Use of undefined constant STDERR - assumed 'STDERR' in b/test.php/b on line b4/bbr / br / bWarning/b: fwrite(): supplied argument is not a valid stream resource in b/test.php/b on line b4/bbr / How can I access the original STDERR handle? The constant should be there, but does not exist. regards Marten These I/O streams are only present in the CLI SAPI. -- Daniel Egeberg Please confirm that the code of my previous replay on this topic (executed via php-cli) does not print out test2 or test3. The constant is present but doesn't work as supposed. Regards
Re: [PHP] constants STDOUT, STDERR, STDIN not working in 5.2.x?
On Tue, Mar 23, 2010 at 15:50, Jan G.B. ro0ot.w...@googlemail.com wrote:
2010/3/23 Daniel Egeberg degeb...@php.net
On Tue, Mar 23, 2010 at 11:47, Marten Lehmann lehm...@cnm.de wrote:
Hello,
I found different code examples like this, which use the file handle
STDERR
just like this:
?php
fwrite(STDERR, hello\n);
?
Also, the PHP documentation of input/output streams
(http://php.net/manual/de/wrappers.php.php) says:
It is recommended that you simply use the constants STDIN, STDOUT and
STDERR instead of manually opening streams using these wrappers.
I don't want to use the php://stderr wrapper, because this just
creates a
duplicate of the original STDERR handler and if I'm closing
php://stderr,
the original STDERR still would exist.
When I'm using this code, I only get:
bNotice/b: Use of undefined constant STDERR - assumed 'STDERR' in
b/test.php/b on line b4/bbr /
br /
bWarning/b: fwrite(): supplied argument is not a valid stream
resource
in b/test.php/b on line b4/bbr /
How can I access the original STDERR handle? The constant should be
there,
but does not exist.
regards
Marten
These I/O streams are only present in the CLI SAPI.
--
Daniel Egeberg
Please confirm that the code of my previous replay on this topic (executed
via php-cli) does not print out test2 or test3. The constant is present
but doesn't work as supposed.
Regards
You are making a number of errors there:
1) You are trying to open php://stderr in read mode, but that stream
is write only (I'm not sure why it outputs regardless).
2) You are trying to open STDERR, but that constant holds a stream
resource while fopen() expects a string.
3) You are trying to write to 'php://stderr'. That's not possible. You
cannot pass a string as stream.
The following should work:
dan...@daniel-laptop:~$ cat test.php
?php
$stderr = fopen('php://stderr', 'w');
fwrite($stderr, 'Error 1' . PHP_EOL);
fwrite(STDERR, 'Error 2' . PHP_EOL);
echo 'Normal echo';
dan...@daniel-laptop:~$ php test.php /dev/null
Error 1
Error 2
dan...@daniel-laptop:~$ ./src/php-5.2.12/sapi/cli/php test.php /dev/null
Error 1
Error 2
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[PHP] CONSTANTS and good coding practice
Can someone explain to me the value of using defined custom constants, in the context of good coding practice. I don't recall ever seeing define() used in the scripts I've seen and only the characteristics are described in the my php book and the php manual; but, not the use. Thanks. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] CONSTANTS and good coding practice
From: Al [EMAIL PROTECTED] Friday, May 21, 2004 9:02 AM Subject: [PHP] CONSTANTS and good coding practice Can someone explain to me the value of using defined custom constants, in the context of good coding practice. Constants are useful anywhere you find yourself typing a constant (i.e. 20, 'Ralph') and the value is used in more than one place in the code. Say you have a script that fetches 10 articles from a db, and then loads them into an html table. You could hard code the 10 into the sql statement, for loop, while loop or what ever logic used to fetch and load the table. If you instead used a constant, then when the client asks that the table now list 15 rows, all you need to do is change the value in one place in the code instead of searching for 10 everywhere and evaluating if the 10 found has anything to do with the logic. Arguably, you could use a variable for the same purpose, but constants can't change value, and thus you protect yourself from self inflicted coding injuries (as well as injection of values over get, post, etc). The only oddity I find in using constants in php, is that you can't use them inside single or double quotes and always have to break out and use concatenation. --- The future will be better tomorrow --- http://www.spiceplace.com/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] CONSTANTS and good coding practice
Al wrote:
Can someone explain to me the value of using defined custom constants,
in the context of good coding practice.
I don't recall ever seeing define() used in the scripts I've seen and
only the characteristics are described in the my php book and the php
manual; but, not the use.
Talking about constants. I've seen the most scripts and web pages, (like
some Open Source projects) They declare the database access values as
vars not constants. I mean Username, Password, DataBase Name or Host.
In my point of view, this info is always constant on the script life, so
it will be better to declare it as constants not as vars.
I normally declare as constants anything that will not change in the
scripts life. Parhaps can change from one installation to another, but
no more. Specially if I'm not completly sure that the value is correct
for my purposes, I prefer to declare a constant and not directly write
the value everywhere. It makes me easier to read and remember, and
easier to change in future if I need it.
For example, I think that :
if ($user_level == USR_LEVEL_WEBMASTER) {
// do stuff
}
is a lot easier to read and to imagine what we are looking for than:
if ($user_level == 255) {
// do stuff
}
Another way I use constants is when I want to pass to a function a sum
of options. In this case imagine that function (Perhaps inside a class):
function draw_box($options) {
// do stuff
}
and this constants:
define('BOX_DRAW_BORDER', 1);
define('BOX_FILL_BACKGROUND', 2);
define('BOX_SHOW_TITLE', 4);
define('BOX_MAKE_LINKS' 8);
Then, I can call the function like this:
$box_options = BOX_DRAW_BORDER + BOX_FILL_BACKGROUND + BOX_MAKE_LINKS;
draw_box($box_options);
Finally, I normally use constants to declare all literal values that
must be shown in the users browser. This is a need for me, beacuse in my
country (Catalunya) we are bilinguals, and I have to be able to show
literals in one or other language depending on the preferences. This
makes scripts translation more easy, because I have all strings in one
(or two) file.
I think, we should use constants always when we have a constant value
(wich not will change on scrits' life).
Regards,
Jordi.
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RE: [PHP] Constants
[snip]
?php
interface Foo {
const MY_FOO = hello world;
}
class Bar implements Foo {
public function displayFoo(){
print MY_FOO;
}
}
$obj = new Bar;
$obj-displayFoo();
?
The results should display hello world, but it prints out MY_FOO.
[/snip]
This is not a bug, but a misunderstanding of constants. You have not
defined the constant
define(MY_FOO, hello world.);
http://us4.php.net/constants
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RE: [PHP] Constants
Not too fast.
From http://www.php.net/zend-engine-2.php
PHP 5 introduces per-class constants:
?php
class Foo {
const constant = constant;
}
echo Foo::constant = . Foo::constant . \n;
?
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RE: [PHP] Constants
[snip]
Not too fast.
From http://www.php.net/zend-engine-2.php
PHP 5 introduces per-class constants:
?php
class Foo {
const constant = constant;
}
echo Foo::constant = . Foo::constant . \n;
?
[/snip]
My bad. Still not a bug.
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Re: [PHP] Constants
If you define constants with in a interface and then implement that
interface
it does not work on 5RC1
This should work, but it displays the constant name rather than value it
references
interface Settings {
const UNAME = somename;
const PWORD = password;
const SERVER = localhost;
}
class Conn implements Settings {
public function __construct(){
$dbConn = mysql_connect(SERVER, UNAME, PWORD);
}
}
Jay Blanchard [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
[snip]
Not too fast.
From http://www.php.net/zend-engine-2.php
PHP 5 introduces per-class constants:
?php
class Foo {
const constant = constant;
}
echo Foo::constant = . Foo::constant . \n;
?
[/snip]
My bad. Still not a bug.
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Re: [PHP] Constants
IIRC it was changed to
self::CONST_NAME recently
interface Settings {
const UNAME = somename;
const PWORD = password;
const SERVER = localhost;
}
class Conn implements Settings {
public function __construct(){
$dbConn = mysql_connect(self::SERVER, self::UNAME, self::PWORD);
}
}
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Re: [PHP] Constants
Give this a read:
http://marc.theaimsgroup.com/?l=php-devm=107936530102181w=2
Am Dienstag, 23. März 2004 15:16 schrieb Red Wingate:
IIRC it was changed to
self::CONST_NAME recently
interface Settings {
const UNAME = somename;
const PWORD = password;
const SERVER = localhost;
}
class Conn implements Settings {
public function __construct(){
$dbConn = mysql_connect(self::SERVER, self::UNAME, self::PWORD);
}
}
-- red
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Re: [PHP] Constants
Thanks, will do.
Red Wingate [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
Give this a read:
http://marc.theaimsgroup.com/?l=php-devm=107936530102181w=2
Am Dienstag, 23. März 2004 15:16 schrieb Red Wingate:
IIRC it was changed to
self::CONST_NAME recently
interface Settings {
const UNAME = somename;
const PWORD = password;
const SERVER = localhost;
}
class Conn implements Settings {
public function __construct(){
$dbConn = mysql_connect(self::SERVER, self::UNAME,
self::PWORD);
}
}
-- red
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[PHP] Constants
The bug server looks like its down, so I will just post the bug here, and
hopefully someone
will spot it
PHP version: 5RC1
?php
interface Foo {
const MY_FOO = hello world;
}
class Bar implements Foo {
public function displayFoo(){
print MY_FOO;
}
}
$obj = new Bar;
$obj-displayFoo();
?
The results should display hello world, but it prints out MY_FOO.
Thanks
Jakes
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[PHP] Constants in class definitions
Hi all.
I was wondering if using defined constants in class definitions
is completely legal (or even good practice) in PHP.
For example,
?php
define( CONSTANT, hello );
class Yep{
$var stuff = array( CONSTANT = 'two' );
}
?
I've looked throught the PHP documentation and from what I can
tell it is legal. I'm using PHP4.3.4, and haven't had any problems with
class definitions like this.
However, I've had some problems with Turck MMCache and class definitions
that are similar to above. I suspect that it's probably a bug with
MMCache but I wanted to check to make sure that the code was completely
correct.
The following seems to work fine with MMCache,
?php
define( CONSTANT, hello );
class Yep{
$var stuff = NULL;
function Yep(){
$this-stuff = array( CONSTANT = 'two' );
}
}
?
If it turns out that the first example is fine, then I'll look a submitting
a bug for MMCache.
Thanks
Toro
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Re: [PHP] Constants in class definitions
Hello Toro, Tuesday, February 24, 2004, 12:22:29 AM, you wrote: TH Hi all. TH I was wondering if using defined constants in class definitions TH is completely legal (or even good practice) in PHP. I see absolutely no reason why not. Constants are just ways of defining non-changing variables, there is nothing about them that controls where they apply (i.e. their scope) and if anything the PHP manual itself backs up the fact you can use them in a class: Like superglobals, the scope of a constant is global. You can access constants anywhere in your script without regard to scope. Global to me means what it says - global. In a class, a function, an include, whatever. -- Best regards, Richard Davey http://www.phpcommunity.org/wiki/296.html -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Constants in class definitions
On Tue, 2004-02-24 at 08:22, Toro Hill wrote: I've looked throught the PHP documentation and from what I can tell it is legal. I'm using PHP4.3.4, and haven't had any problems with class definitions like this. I use constants in classes myself without problems. In PHP 5 you can actually declare constant class properties! :) However, I've had some problems with Turck MMCache and class definitions that are similar to above. I suspect that it's probably a bug with MMCache but I wanted to check to make sure that the code was completely correct. I also use MMCache, mind sharing the problems you are experiencing? -- Adam Bregenzer [EMAIL PROTECTED] http://adam.bregenzer.net/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Constants in class definitions
Hi Adam.
I was wondering if using defined constants in class definitions
is completely legal (or even good practice) in PHP.
I've looked throught the PHP documentation and from what I can
tell it is legal.
However, I've had some problems with Turck MMCache and class definitions
that are similar to above. I suspect that it's probably a bug with
MMCache but I wanted to check to make sure that the code was completely
correct.
I also use MMCache, mind sharing the problems you are experiencing?
Here's the situation:
PHP 4.3.4
Apache 1.3.29
MMCache 2.4.6
I'm ending up with some garbage in certain class variables.
The code runs fine without MMCache disabled.
There seems to be a very specific circumstances under which the error occurs.
Namely:
1. The constants must be defined in a seperate file.
2. The member array ($stuff, refer below) must be populated in the class definition, not the class constructor
3. index.php can't be modified after apache has been started. If I touch index.php then the problem disappears, but then if I restart apache the problem reappears.
If you want to see the output of the script go to http://outreach.net.nz/test/
Here's the MMCache configuration:
extension=mmcache.so
;shm_size=0 defaults to the OS default, which is 32M on my system
mmcache.shm_size=0
mmcache.cache_dir=/tmp/mmcache
mmcache.enable=1
mmcache.optimizer=1
mmcache.check_mtime=1
mmcache.debug=0
mmcache.filter=
mmcache.shm_max=0
mmcache.shm_ttl=0
mmcache.shm_prune_period=0
mmcache.shm_only=0
mmcache.compress=1
Here's the code:
index.php
?php
require_once( include.php );
class Yep{
var $stuff = array(
HELLO = 'nope',
goodbye = 'nah' );
//var $stuff = array();
function Yep(){
/*$this-stuff = array(
HELLO = 'nope',
goodbye = 'nah' );*/
echo 'yep constructorbr';
}
function stuff(){
echo 'pre';
var_dump( $this-stuff );
echo '/pre';
}
}
$yepper = new Yep();
$yepper-stuff();
echo 'br';
var_dump( $yepper );
?
include.php
?php
define( 'HELLO', 'hello' );
define( 'goodbye', 'GOODBYE' );
?
Thanks for the offer to share.
Toro
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Re: [PHP] Constants in class definitions
On Tue, 2004-02-24 at 09:26, Toro Hill wrote: Here's the situation: PHP 4.3.4 Apache 1.3.29 MMCache 2.4.6 I'm ending up with some garbage in certain class variables. The code runs fine without MMCache disabled. There seems to be a very specific circumstances under which the error occurs. Namely: 1. The constants must be defined in a seperate file. 2. The member array ($stuff, refer below) must be populated in the class definition, not the class constructor 3. index.php can't be modified after apache has been started. If I touch index.php then the problem disappears, but then if I restart apache the problem reappears. If you want to see the output of the script go to http://outreach.net.nz/test/ Wow, looks like a bug to me, good find! -- Adam Bregenzer [EMAIL PROTECTED] http://adam.bregenzer.net/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] constants
hi, why should I use constants? thx for help Michael -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] constants
hi, you can use constantswhenever you want something whosevalue you don't want changed accidently.for e.g. i use a constant to keep track of the path. if i am at the root level then i store "./" in it. and if i am one folder under the root then istore "../" in it. now as i tend to name variables like this strPath (str for string) i often end up changing the value of strPath to something else in the script. to stop this from happening i use constants HTH, Haseeb ---Original Message--- From: Michael Müller Date: Monday, July 21, 2003 04:22:03 PM To: [EMAIL PROTECTED] Subject: [PHP] constants hi, why should I use constants? thx for help Michael -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php IncrediMail - Email has finally evolved - Click Here
[PHP] Constants in heredoc strings?
Is there a way to expand constants in heredoc strings without assigning the constant's value to a variable first? -- Jeff S. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Constants in heredoc strings?
-Original Message- From: Jeff Stewart Is there a way to expand constants in heredoc strings without assigning the constant's value to a variable first? -- No. Cheers! Mike -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Constants and Here Document Interpolation
Can anyone tell me if it is possible (and how) to use defined constants within here document content? I've not been successful finding anything on this in the online docs. Thanks! Dan -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Constants and Here Document Interpolation
Hello, It doesn't look like it - a note in the constants manual entry reads: PHP has no way of recognizing the constant from any other string of characters within the heredoc block Danny. -Original Message- From: Daniel R. Hansen [mailto:[EMAIL PROTECTED] Sent: 01 March 2003 15:57 To: [EMAIL PROTECTED] Can anyone tell me if it is possible (and how) to use defined constants within here document content? I've not been successful finding anything on this in the online docs. Thanks! Dan -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Constants and Here Document Interpolation
At 16:56 01.03.2003, Daniel R. Hansen said:
[snip]
Can anyone tell me if it is possible (and how) to use defined constants
within here document content? I've not been successful finding anything
on this in the online docs.
[snip]
You simply could have tried it - it's trivial.
The answer: no, you cannot have a constant within a string, be it heredoc
or quoted. A constant must always reside on native code level.
However you can easily concatenate strings and heredocs - both of the
examples below work correctly:
define('A_CONSTANT', 1);
$text1 = EOT
This heredoc text contains the constant A_CONSTANT (
EOT
. A_CONSTANT . EOT
) outside the heredoc construct...
EOT;
$text2 = This quoted text contains the constant A_CONSTANT ( .
A_CONSTANT .
) outside the string quotes...;
echo $text1br /$text2;
Output:
This heredoc text contains the constant A_CONSTANT (1) outside the heredoc
construct...
This quoted text contains the constant A_CONSTANT (1) outside the string
quotes...
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O Ernest E. Vogelsinger
(\)ICQ #13394035
^ http://www.vogelsinger.at/
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FW: [PHP] Constants and Here Document Interpolation
Actually I did try it and couldn't think of a way to work around the matter.
Thanks for the suggestion.
-Original Message-
From: Ernest E Vogelsinger [mailto:[EMAIL PROTECTED]
Sent: Saturday, March 01, 2003 12:56 PM
To: Daniel R. Hansen
Cc: [EMAIL PROTECTED]
Subject: Re: [PHP] Constants and Here Document Interpolation
At 16:56 01.03.2003, Daniel R. Hansen said:
[snip]
Can anyone tell me if it is possible (and how) to use defined constants
within here document content? I've not been successful finding anything
on this in the online docs.
[snip]
You simply could have tried it - it's trivial.
The answer: no, you cannot have a constant within a string, be it heredoc
or quoted. A constant must always reside on native code level.
However you can easily concatenate strings and heredocs - both of the
examples below work correctly:
define('A_CONSTANT', 1);
$text1 = EOT
This heredoc text contains the constant A_CONSTANT (
EOT
. A_CONSTANT . EOT
) outside the heredoc construct...
EOT;
$text2 = This quoted text contains the constant A_CONSTANT ( .
A_CONSTANT .
) outside the string quotes...;
echo $text1br /$text2;
Output:
This heredoc text contains the constant A_CONSTANT (1) outside the heredoc
construct...
This quoted text contains the constant A_CONSTANT (1) outside the string
quotes...
--
O Ernest E. Vogelsinger
(\)ICQ #13394035
^ http://www.vogelsinger.at/
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Re: FW: [PHP] Constants and Here Document Interpolation
At 19:28 01.03.2003, Daniel R. Hansen said: [snip] Actually I did try it and couldn't think of a way to work around the matter. Thanks for the suggestion. -Original Message- From: Ernest E Vogelsinger [mailto:[EMAIL PROTECTED] You simply could have tried it - it's trivial. [blah] [snip] My apologies - by rereading my message it sounds straightforward arrogant which it wasn't meant to be. I was referring to your statement didn't find anything in the online docs that led me to the perception you didn't even try it - sorry for that (but there are so many posters asking questions that wouldn't even arise if they only had _tried_ it). Hope my suggestion helps though :-) -- O Ernest E. Vogelsinger (\)ICQ #13394035 ^ http://www.vogelsinger.at/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Constants for dummies, please?
Help, please -- I've just started looking at my first line of PHP code.
:)
A little background, I am *not really* a programmer: I went to art
school.
I have taught myself to develop web stuff in another language: Lasso,
but have no training.
In any case, I am looking through a php script that I've downloaded,
and most of it makes at least some sense to me, but I have come upon:
?php
define('BASE', './');
include(BASE.'Functions/foo.php');
?
Now, like any good lister, I checked the source first: php.net
http://www.php.net/manual/en/language.constants.php says:
A constant is a identifier (name) for a simple value. As the name
suggests, that value cannot change during the execution of the script
(except the magic constants which aren't actually constants). A
constant is case-sensitive by default. By convention constant
identifiers are always uppercase.
[...]
The scope of a constant is global--you can access it anywhere in your
script without regard to scope.
So it is apparently *similar*, but not *exactly like* a variable, right?
Can anyone explain the difference to me?
A particular question I have is about what this phrase means:
The scope of a constant is global--you can access it anywhere in your
script without regard to scope.
When it says anywhere in your script does that mean it's available to
all of PHP?
Or it is global to the rest of the file currently being processed,
regardless of namespace, unlike a normal variable which might be
unavailable in certain namespaces in the file?
Also, if anyone knows the subtleties of how any such differences effect
the rest of the script, that'd be wonderful, too.
Thanks for any help!
- me
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Re: [PHP] Constants for dummies, please?
Some thoughts on variables and constants:
a) You can't redefine a constant but can redefine
a variable.
b) Constants are autoglobal (like superglobals) so
for example:
?php
define ('CONSTANT', 'some value');
$variable = 'some value';
function foo() {
global $variable;
print $variable;
print CONSTANT;
}
foo();
?
Had we not used global $variable, the $variable
would not have been available inside the function.
But, the constant is AUTOglobal so it is. Read:
Variable Scope:
http://www.php.net/variables.scope
c) Constants must be scalar values in PHP4, (so
not arrays, objects, or resources).
d) Constants are cool, variables are cool too.
Regards,
Philip Olson
On Fri, 21 Feb 2003, Chris Corwin wrote:
Help, please -- I've just started looking at my first line of PHP code.
:)
A little background, I am *not really* a programmer: I went to art
school.
I have taught myself to develop web stuff in another language: Lasso,
but have no training.
In any case, I am looking through a php script that I've downloaded,
and most of it makes at least some sense to me, but I have come upon:
?php
define('BASE', './');
include(BASE.'Functions/foo.php');
?
Now, like any good lister, I checked the source first: php.net
http://www.php.net/manual/en/language.constants.php says:
A constant is a identifier (name) for a simple value. As the name
suggests, that value cannot change during the execution of the script
(except the magic constants which aren't actually constants). A
constant is case-sensitive by default. By convention constant
identifiers are always uppercase.
[...]
The scope of a constant is global--you can access it anywhere in your
script without regard to scope.
So it is apparently *similar*, but not *exactly like* a variable, right?
Can anyone explain the difference to me?
A particular question I have is about what this phrase means:
The scope of a constant is global--you can access it anywhere in your
script without regard to scope.
When it says anywhere in your script does that mean it's available to
all of PHP?
Or it is global to the rest of the file currently being processed,
regardless of namespace, unlike a normal variable which might be
unavailable in certain namespaces in the file?
Also, if anyone knows the subtleties of how any such differences effect
the rest of the script, that'd be wonderful, too.
Thanks for any help!
- me
--
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To unsubscribe, visit: http://www.php.net/unsub.php
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[PHP] constants and sessions
I have to change the constant maximum_time_out (via set_timeout_limit) on the first script, and keep it seted in a session, until the second script became to be loaded. Is that possible? [[]]'s Bragatto PS: sorry for my miserable english #) -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] constants and case sensitivity
just when I thought , nice I didn't know how does it work i found out that
it is not wroking anyhow if I put
define ("rights", "RIGHTS", X);
define ("Rights", "RIGHTS", X);
echo rights . "-" .defined("rights") ." " .Rights ."-"
.defined("Rights")."br";
regardless of X i always get
RIGHTS-1 Rights-0
but if i change places of definiton it changes
define ("rights", "RIGHTS", X);
define ("Rights", "RIGHTS", X);
..
Rights-0 RIGHTS-1
again I am using 3.0.11 on IIS4
thanks
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RE: [PHP] constants and case sensitivity
I get the same results as you using PHP4. I can't explain this, since
constants are supposed to be case sensitive by default. They sure don't act
like they are. Looks like a bug to me.
Kirk
-Original Message-
From: almir [mailto:[EMAIL PROTECTED]]
Sent: Friday, March 30, 2001 12:44 PM
To: [EMAIL PROTECTED]
Subject: [PHP] constants and case sensitivity
just when I thought , nice I didn't know how does it work i
found out that
it is not wroking anyhow if I put
define ("rights", "RIGHTS", X);
define ("Rights", "RIGHTS", X);
echo rights . "-" .defined("rights") ." " .Rights ."-"
.defined("Rights")."br";
regardless of X i always get
RIGHTS-1 Rights-0
but if i change places of definiton it changes
define ("rights", "RIGHTS", X);
define ("Rights", "RIGHTS", X);
..
Rights-0 RIGHTS-1
again I am using 3.0.11 on IIS4
thanks
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[EMAIL PROTECTED]
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Re: [PHP] constants inside of a string
This reminded me of an issue I've kind of been contemplating
for a couple of weeks now... I got sick of having to
connect, query, check for errors, etc. every time I wanted
to query a mysql database, so I wrote a function to do all
of it for me... something like:
function query_db($queryString, $file, $line) {
// do db stuff
// if error, die using $file and $line (actually using
constants __FILE__ and __LINE__ only tell me that it died in
this function)
// return results of query
}
Now, to call the function I've been using:
$result = query_db("SELECT * FROM myTable", __FILE__,
__LINE__);
It'd be nice to be able to get __FILE__ and __LINE__ where
the function was called without passing them as parameters.
Even if I could just define a macro _HERE_ to expand into
__FILE__, __LINE__ it would save me some time...
I know it sounds lazy, but if there was a way so I could
just call
$result = query_db("SELECT * FROM myTable");
it'd be so much nicer...
PS - I don't want to get into db abstraction and all that...
I just wonder if what I'm talking about is easy/possible.
Thanks for input -
--Toby
- Original Message -
From: "Moritz Petersen" [EMAIL PROTECTED]
Sent: Wednesday, January 10, 2001 3:18 PM
Subject: RE: [PHP] constants inside of a string
snip
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