Re: [PHP] PHP_SELF Undefined
On Tue, 19 Feb 2002 09:50, Narvaez, Teresa did align ASCII characters thusly: When I execute the code below, why is PHP_SELF undefined? I will appretiate any help on this. I can get its value by: echo $_SERVER[PHP_SELF];Thanks in advance! -Teresa HTML HEAD TITLEFeedback/TITLE /HEAD BODY ? $form_block = FORM method=\POST\ action=\$PHP_SELF\ PYour Name:br INPUT type=\text\ name=\sender_name\ size=30/p PYour E-Mail Address:br INPUT type=\text\ name=\sender_email\ size=30/p PYour Message:br textarea name=\message\ cols=30 rows=5/textarea /p PINPUT type=\submit\ value=\Send This Form\/p /FORM ; ? I don't know whether this is of any help to you or not, but this works perfectly on my system. I suspected it would as I saw nothing wrong, per se, with the code. Cheers, Brad -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] PHP_SELF Undefined
-Original Message-
From: Matt [mailto:[EMAIL PROTECTED]]
Sent: 18 February 2002 23:30
To: Lars Torben Wilson
$foo = This page is $_SERVER[PHP_SELF];
Or, better:
$foo = This page is {$_SERVER['PHP_SELF']};
You do have to concat to do this in single-quoted (noninterpolated)
strings, though.
http://www.php.net/manual/en/language.types.string.php#languag
e.types.string
.parsing
Can you expand on why the first option isn't generally
acceptable?
Another reason, as I understand it (and I'm sure Torben will correct me if I'm
wrong!), is that in the version without quotes, PHP_SELF is taken as the name of a
constant -- which, as it happens to be undefined, PHP very kindly assumes you intended
to be the equivalent string 'PHP_SELF'. This is bad for two reasons: (1) the PHP
compiler is doing avoidable extra work to get the desired result; (2) if you just
happen, at a later date, to define a constant of that name, your result will suddenly
be wrong (unlikely with PHP_SELF, I admit, but less so with something like, say,
MAX_SIZE). Even though this is only a theoretical danger of low probability, the
principles of good defensive programming would suggest that you nonetheless avoid it
with a vengeance!!
Cheers!
Mike
-
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RE: [PHP] PHP_SELF Undefined
On Tue, 2002-02-19 at 05:14, Ford, Mike [LSS] wrote:
-Original Message-
From: Matt [mailto:[EMAIL PROTECTED]]
Sent: 18 February 2002 23:30
To: Lars Torben Wilson
$foo = This page is $_SERVER[PHP_SELF];
[snip]
Can you expand on why the first option isn't generally
acceptable?
Another reason, as I understand it (and I'm sure Torben will correct
me if I'm wrong!), is that in the version without quotes, PHP_SELF is
taken as the name of a constant -- which, as it happens to be undefined,
PHP very kindly assumes you intended to be the equivalent string
'PHP_SELF'. This is bad for two reasons: (1) the PHP compiler is doing
avoidable extra work to get the desired result; (2) if you just happen,
at a later date, to define a constant of that name, your result will
suddenly be wrong (unlikely with PHP_SELF, I admit, but less so with
something like, say, MAX_SIZE). Even though this is only a theoretical
danger of low probability, the principles of good defensive programming
would suggest that you nonetheless avoid it with a vengeance!!
Cheers!
Mike
You're very right, but even worse than constant collisions are the
keyword collisions, as far as WTF factor goes:
?php
$array('default' = 'Select an option',
'option1' = 'First option',
'option2' = 'Second option');
echo $array[default]; // Parse error.
?
This one has come up a number of times.
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Re: [PHP] PHP_SELF Undefined
On Monday, February 18, 2002, at 05:50 PM, Narvaez, Teresa wrote: When I execute the code below, why is PHP_SELF undefined? I will appretiate any help on this. I can get its value by: echo $_SERVER[PHP_SELF];Thanks in advance! -Teresa HTML HEAD TITLEFeedback/TITLE /HEAD BODY ? $form_block = FORM method=\POST\ action=\$PHP_SELF\ ^ It hasn't been pulled from the $_SERVER array. It worked for you when you did it the first way, so try doing it that same way in the code: form method=\post\ action=\ . $_SERVER['PHP_SELF'] . \ Note that I had to jump out of the string and concatenate it to the variable, because PHP doesn't let you just use $_* variables in the middle of a string. I also made sure to jump back into the string to finish the HTML form tag. If you don't like doing it this way, do something like $PHP_SELF = $_SERVER['PHP_SELF']; $form_block = form method=\post\ action=\$PHP_SELF\; HTH Erik Erik Price Web Developer Temp Media Lab, H.H. Brown [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] PHP_SELF Undefined
On Mon, 2002-02-18 at 15:02, Erik Price wrote:
On Monday, February 18, 2002, at 05:50 PM, Narvaez, Teresa wrote:
When I execute the code below, why is PHP_SELF undefined? I will
appretiate
any help on this. I can get its value by:
echo $_SERVER[PHP_SELF];Thanks in advance! -Teresa
HTML
HEAD
TITLEFeedback/TITLE
/HEAD
BODY
?
$form_block =
FORM method=\POST\ action=\$PHP_SELF\
^
It hasn't been pulled from the $_SERVER array. It worked for you when
you did it the first way, so try doing it that same way in the code:
form method=\post\ action=\ . $_SERVER['PHP_SELF'] . \
Note that I had to jump out of the string and concatenate it to the
variable, because PHP doesn't let you just use $_* variables in the
middle of a string. I also made sure to jump back into the string to
finish the HTML form tag.
Sorry, but I do have to correct you here--this isn't true. ;) In double-
quoted strings and heredocs, you can do the following:
$foo = This page is $_SERVER[PHP_SELF];
Or, better:
$foo = This page is {$_SERVER['PHP_SELF']};
You do have to concat to do this in single-quoted (noninterpolated)
strings, though.
http://www.php.net/manual/en/language.types.string.php#language.types.string.parsing
Cheers,
Torben
If you don't like doing it this way, do something like
$PHP_SELF = $_SERVER['PHP_SELF'];
$form_block = form method=\post\ action=\$PHP_SELF\;
HTH
Erik
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Re: [PHP] PHP_SELF Undefined
$foo = This page is $_SERVER[PHP_SELF];
Or, better:
$foo = This page is {$_SERVER['PHP_SELF']};
You do have to concat to do this in single-quoted (noninterpolated)
strings, though.
http://www.php.net/manual/en/language.types.string.php#language.types.string
.parsing
Can you expand on why the first option isn't generally acceptable? I can
understand there being an issue with spaces in an index, but is there some
other reason that the latter is prefered?
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Re: [PHP] PHP_SELF Undefined
On Mon, 2002-02-18 at 15:29, Matt wrote:
$foo = This page is $_SERVER[PHP_SELF];
Or, better:
$foo = This page is {$_SERVER['PHP_SELF']};
You do have to concat to do this in single-quoted (noninterpolated)
strings, though.
http://www.php.net/manual/en/language.types.string.php#language.types.string
.parsing
Can you expand on why the first option isn't generally acceptable? I can
understand there being an issue with spaces in an index, but is there some
other reason that the latter is prefered?
A couple of reasons. For one, it's just inconsistent in that string
indices should always be quoted--but then not in strings. So people tend
to think that since $_SERVER[PHP_SELF] is OK, that $_SERVER[PHP_SELF]
would be OK too--when it's not. It's more of an issue when giving
examples and writing docs than for coding, really--but it doesn't hurt.
The other reason is that the parser needs help resolving ambiguity with
more complex expressions inside strings. If you use this syntax all the
time, you won't get bitten in the butt later. Check this out:
?php
error_reporting(E_ALL);
$array = array('foo' = array('bar' = 'baz'));
echo My Baz is $array[foo][bar]\n;
echo My Baz is {$array['foo']['bar']}\n;
?
Many times I've had to explain why the output is:
My Baz is Array[bar]
My Baz is baz
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Re: [PHP] PHP_SELF Undefined
On Monday, February 18, 2002, at 06:14 PM, Lars Torben Wilson wrote:
Sorry, but I do have to correct you here--this isn't true. ;) In double-
quoted strings and heredocs, you can do the following:
$foo = This page is $_SERVER[PHP_SELF];
Or, better:
$foo = This page is {$_SERVER['PHP_SELF']};
You do have to concat to do this in single-quoted (noninterpolated)
strings, though.
Ah, I had forgotten about that. I stay away from the first version, and
completely forgot about the second version. Ironic, because IIRC it is
the answer to one of the first questions I posted on this list. (I was
trying to include mysql_fetch_array elements in print statements and
didn't want to transfer the value to a scalar beforehand, or
something! :)
Erik
Erik Price
Web Developer Temp
Media Lab, H.H. Brown
[EMAIL PROTECTED]
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Re: [PHP] PHP_SELF Undefined
The other reason is that the parser needs help resolving ambiguity with
more complex expressions inside strings. If you use this syntax all the
time, you won't get bitten in the butt later.
I've used the ${$var} to resolve the ambiguity of variable variables, but I
wasn't aware that if could solve the problem with arrays within strings.
I've always broke out of the string for the array part, and concatenated the
rest of the string after that. I thought that was ugly, so of late I had
been using the unquoted index inside strings.
Thanks, Lars, for setting me straight on this.
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Re: [PHP] PHP_SELF Undefined
When I execute the code below, why is PHP_SELF undefined? I will appretiate any help on this. I can get its value by: echo $_SERVER[PHP_SELF];Thanks in advance! -Teresa Is your PHP install = version 4.1.0 ? You can test with a call to phpinfo(); If your version is less than 4.1.0, try the global variable $PHP_SELF instead. Greg Donald - http://destiney.com/ http://phprated.com/ | http://phplinks.org/ | http://phptopsites.com/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] PHP_SELF Undefined
I had this problem while running PHP under windows. I solved (well, rounded :) the problem with $SCRIPT_NAME (if I remember it right) which gives the very same result. Niklas -Original Message- From: Greg Donald [mailto:[EMAIL PROTECTED]] Sent: 19. helmikuuta 2002 8:05 To: [EMAIL PROTECTED] Subject: Re: [PHP] PHP_SELF Undefined When I execute the code below, why is PHP_SELF undefined? I will appretiate any help on this. I can get its value by: echo $_SERVER[PHP_SELF];Thanks in advance! -Teresa Is your PHP install = version 4.1.0 ? You can test with a call to phpinfo(); If your version is less than 4.1.0, try the global variable $PHP_SELF instead. Greg Donald - http://destiney.com/ http://phprated.com/ | http://phplinks.org/ | http://phptopsites.com/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
