[PHP] Variable scope
Can anyone explain this to me.
function sendEmail($uname,$subjField,$firstname,$lastname,$email,
$reply,$e_cc,$e_bcc,$comments,$ip,$Date,$time){
$uname = trim($uname);
$subjField = trim($subjField);
$firstname = trim($firstname);
$lastname = trim($lastname);
$email = trim($email);
$reply = trim($reply);
$e_cc = trim($e_cc);
$e_bcc = trim($e_bcc);
$comments = trim($comments);
$ip = trim($ip);
$Date = trim($Date);
$time = trim($time);
//If I trace here email, reply and the CCs are ok
if(($firstname strlen($firstname = trim($firstname)) 2)
($lastname strlen($lastname = trim($lastname)) 2)) {
$fullname = $firstname. .$lastname;
} else {
$fullname = Member;
}
$fullname = trim($fullname);
$To = ;
$from = ;
$headerTXT = ;
$bounce_email = CO_NAME. .BOUNCE_ADDR.;
$subject = $subjectField;
$bulk = false;
//What kind of email is being sent
//Email exists, no Cc or Bcc
if(!empty($email) empty($_email_cc) empty($_email_bcc)) {
$To = $fullname. .$email.;
$from = Member .$reply.;
$headerTXT = New message from .CO_NAME. member .$uname;
$bulk = false;
}
//Email empty, Cc exists no Bcc
else if(empty($email) !empty($e_cc) empty($e_bcc)) {
$To = $bounce_email;
$from = Member .$reply.;
$headerTXT = New message from .CO_NAME. member .$uname;
$bulk = true;
}
...
//If I trace here $To, $from have everything except the (anything
between), so for instance..
$To = John Doe ;
$from = Member ;
not
$To = John Doe j...@email.com ;
$from = Member mem...@company.com;
So $email and $reply are loosing their value/scope
But the .CO_NAME. and .BOUNCE_ADDR. are working!?!?
This is also in a page with many other email functions just like this
one and they work.
Only difference is the $To and $from are not inside an if() { statement.
How did my variables loose scope???
One other note, if I put..
$To = htmlspecialchars($fullname. .$email.);
then $To is correct when I trace..
$To = John Doe j...@email.com ;
but it wont send because the smtp mail will not send to
$To = John Doe lt;j...@email.comgt;
I MUST be doing something wrong.
Also, I did read about using Name em...@email.com but the other
email functions work fine with those, so I'm not sure what's going on.
TIA,
Best,
Karl DeSaulniers
Design Drumm
http://designdrumm.com
Re: [PHP] Variable scope
On Jul 14, 2011, at 3:54 PM, Karl DeSaulniers wrote:
Can anyone explain this to me.
function sendEmail($uname,$subjField,$firstname,$lastname,$email,
$reply,$e_cc,$e_bcc,$comments,$ip,$Date,$time){
$uname = trim($uname);
$subjField = trim($subjField);
$firstname = trim($firstname);
$lastname = trim($lastname);
$email = trim($email);
$reply = trim($reply);
$e_cc = trim($e_cc);
$e_bcc = trim($e_bcc);
$comments = trim($comments);
$ip = trim($ip);
$Date = trim($Date);
$time = trim($time);
//If I trace here email, reply and the CCs are ok
if(($firstname strlen($firstname = trim($firstname)) 2)
($lastname strlen($lastname = trim($lastname)) 2)) {
$fullname = $firstname. .$lastname;
} else {
$fullname = Member;
}
$fullname = trim($fullname);
$To = ;
$from = ;
$headerTXT = ;
$bounce_email = CO_NAME. .BOUNCE_ADDR.;
$subject = $subjectField;
$bulk = false;
//What kind of email is being sent
//Email exists, no Cc or Bcc
if(!empty($email) empty($_email_cc) empty($_email_bcc)) {
$To = $fullname. .$email.;
$from = Member .$reply.;
$headerTXT = New message from .CO_NAME. member .$uname;
$bulk = false;
}
//Email empty, Cc exists no Bcc
else if(empty($email) !empty($e_cc) empty($e_bcc)) {
$To = $bounce_email;
$from = Member .$reply.;
$headerTXT = New message from .CO_NAME. member .$uname;
$bulk = true;
}
...
//If I trace here $To, $from have everything except the (anything
between), so for instance..
$To = John Doe ;
$from = Member ;
Have you looked at the output in the page source? The may be
getting eaten by the browser. You may want to use htmlentities on your
trace output (but not the actual variables).
not
$To = John Doe j...@email.com ;
$from = Member mem...@company.com;
So $email and $reply are loosing their value/scope
But the .CO_NAME. and .BOUNCE_ADDR. are working!?!?
I assume these are defined constants, which don't have scope (or,
perhaps more accurately, always have global scope).
This is also in a page with many other email functions just like
this one and they work.
Only difference is the $To and $from are not inside an if()
{ statement.
How did my variables loose scope???
One other note, if I put..
$To = htmlspecialchars($fullname. .$email.);
then $To is correct when I trace..
$To = John Doe j...@email.com ;
but it wont send because the smtp mail will not send to
$To = John Doe lt;j...@email.comgt;
I MUST be doing something wrong.
Also, I did read about using Name em...@email.com but the other
email functions work fine with those, so I'm not sure what's going on.
TIA,
Best,
Karl DeSaulniers
Design Drumm
http://designdrumm.com
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[PHP] Variable Scope with require_once
Hello, all.
I have a working app that runs in PHP 4.4.9 on the server. I develop
the app on my local environment, which runs PHP 5.2.6.
The setup is thus:
From my index, I have
require_once('config.php');
require_once('dbstuff.php');
config.php looks like this:
?php
$db_host = 'localhost';
$db_user = 'someuser';
$db_password = 'somepassword';
$
...snipped...
?
dbstuff.php looks like this:
?php
if( !$dbh ) {
$dbh = mysql_connect($db_host, $db_user, $db_password) or die('Could
not connect: ' . mysql_error());
}
...snipped...
?
For some reason, the $db_host, $db_user, and so on defined in config.php
are not accessible from dbstuff.php on my development environment. I
wlll get
[timestamp] [error] [client 127.0.0.1] PHP Notice: Undefined variable:
db_host in somepath\db_stuff.php on line whatever
which causes
'Could not connect: some MySQL error message that is obtained when
attempting to login with a nonexistent user'
This works on the production environment (the one with PHP version
4.4.9). register_globals is Off in both environments.
What is going on, here?
Regards,
A. Wilson
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[PHP] Variable Scope problem passing function parameters
I'm new to PHP 5 and classes, but I've done a lot of ActionScript.
I'm trying to use PHPMailer inside my own class (a service for AMFPHP).
I'm having problems getting the data that'spassed into my class's send()
method to the instance of the PHPMailer.
Basically, I have this:
class EmailAMF {
public function send ($from, $to, $subject, $body) {
require('class.phpmailer.php');
$phpMail = new PHPMailer();
$phpMail-From = $from;
$phpMail-AddAddress($this-to);
$phpMail-Subject = $subject;
$phpMail-Body = $body;
return $phpMail-Send();
}
}
As far as I can tell, it sends an essentially blank email to nobody (but
returns true.
If I replace any of my function variables with strings, like this:
$phpMail-AddAddress('m...@example.com');
the email actually gets that data.
What am I missing?
Thanks,
Jim
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Re: [PHP] Variable Scope problem passing function parameters
Jim McIntyre wrote:
I'm new to PHP 5 and classes, but I've done a lot of ActionScript.
I'm trying to use PHPMailer inside my own class (a service for
AMFPHP). I'm having problems getting the data that'spassed into my
class's send() method to the instance of the PHPMailer.
Basically, I have this:
class EmailAMF {
public function send ($from, $to, $subject, $body) {
require('class.phpmailer.php');
$phpMail = new PHPMailer();
$phpMail-From = $from;
$phpMail-AddAddress($this-to);
$phpMail-Subject = $subject;
$phpMail-Body = $body;
return $phpMail-Send();
}
}
As far as I can tell, it sends an essentially blank email to nobody
(but returns true.
If I replace any of my function variables with strings, like this:
$phpMail-AddAddress('m...@example.com');
the email actually gets that data.
What am I missing?
Thanks,
Jim
$this - to
it has no meaning in the scope of your class.
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Re: [PHP] Variable Scope problem passing function parameters
metastable wrote: Jim McIntyre wrote: $phpMail = new PHPMailer(); $phpMail-From = $from; $phpMail-AddAddress($this-to); $phpMail-Subject = $subject; $phpMail-Body = $body; return $phpMail-Send(); $this - to it has no meaning in the scope of your class. Apparently, neither do the other variable names. If I replace that with a string containing my email address, it sends an email... but everything else in the email is blank - no body, no subject, etc. How do I reference the arguments passed to the function when setting properties or calling methods of the instance of PHPMailer? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] SOLVED Re: [PHP] Variable Scope problem passing function parameters
Jim McIntyre wrote: metastable wrote: Jim McIntyre wrote: $phpMail = new PHPMailer(); $phpMail-From = $from; $phpMail-AddAddress($this-to); $phpMail-Subject = $subject; $phpMail-Body = $body; return $phpMail-Send(); Never mind - I found the problem. It was a lowly typo. Ugh. -Jim -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Variable Scope from child to parent
Ok, I forgot to reply-all to the list. Here we go again.
On Wed, May 14, 2008 at 6:33 PM, Tyson Vanover [EMAIL PROTECTED] wrote:
I am trying to get a child class to pass an array of valid keys to it's
parent when the constructor is run, and the parent appends the data to one
of it's array of valid keys. Then it walks through an array pulling out
values that have valid keys, and putting them in an array for processing
later. I have tried explicitly stating the variable scope.
abstract class parentclass
{
protected $vkeys= array('title1','title2','title3');
protected $a;
function __construct($set = NULL, $special = NULL)
{
self::$this-vkeys= array_merge(self::$this-vkeys, $special);
foreach($set as $key=$value)
{
if (in_array($key,self::$this-vkeys))
{
$this-a[$key] = $value;
}
}
print_r(self::$this-vkeys); //output below
print_r(self::$this-a); //output below
}
}
class childclass extends parentclass
{
protected $vkeys= array('titleA', 'titleB', 'TitleC');
function __construct($set, $special = NULL)
{
parent::__construct($set, self::$this-vkeys);
unset(self::$this-vkeys);
}
}
Unfortunately it seems to duplicate the child's array instead of appending.
Explicitly stating scope does not seem to help.
print_r(self::$this-vkeys);
Array (
[0] = titleA
[1] = titleB
[2] = titleB
[3] = titleA
[4] = titleB
[5] = titleB
)
print_r(self::$this-a);
Array()
Any thoughts?
A couple. First, as Gabriel said, replace self::$this- with just
$this-. Second, the protected variable $vkeys in the childclass
effectively overwrites the variable of the same name in the parent
class, so it already has the values you are trying to merge
(array('titleA', 'titleB', 'TitleC')) when the childclass is
instantiated before you even call the constructor. That's why the
constructor duplicates the values. Try this for the constructor for
your childclass:
function __construct($set, $special = array())
{
$merged = array_merge($special, array('titleA', 'titleB', 'TitleC'));
parent::__construct($set, $merged);
}
Andrew
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[PHP] Variable Scope from child to parent
I am trying to get a child class to pass an array of valid keys to it's
parent when the constructor is run, and the parent appends the data to
one of it's array of valid keys. Then it walks through an array pulling
out values that have valid keys, and putting them in an array for
processing later. I have tried explicitly stating the variable scope.
abstract class parentclass
{
protected $vkeys= array('title1','title2','title3');
protected $a;
function __construct($set = NULL, $special = NULL)
{
self::$this-vkeys= array_merge(self::$this-vkeys, $special);
foreach($set as $key=$value)
{
if (in_array($key,self::$this-vkeys))
{
$this-a[$key] = $value;
}
}
print_r(self::$this-vkeys); //output below
print_r(self::$this-a); //output below
}
}
class childclass extends parentclass
{
protected $vkeys= array('titleA', 'titleB', 'TitleC');
function __construct($set, $special = NULL)
{
parent::__construct($set, self::$this-vkeys);
unset(self::$this-vkeys);
}
}
Unfortunately it seems to duplicate the child's array instead of
appending. Explicitly stating scope does not seem to help.
print_r(self::$this-vkeys);
Array (
[0] = titleA
[1] = titleB
[2] = titleB
[3] = titleA
[4] = titleB
[5] = titleB
)
print_r(self::$this-a);
Array()
Any thoughts?
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Re: [PHP] Variable Scope from child to parent
tyson
i never saw
self::$this-vkeys
doing this you actually are callig the var inside $this-vkeys
do self::$vkeys as static or $this-vkeys as object don't mix
regards
On Wed, May 14, 2008 at 7:33 PM, Tyson Vanover [EMAIL PROTECTED] wrote:
I am trying to get a child class to pass an array of valid keys to it's
parent when the constructor is run, and the parent appends the data to one
of it's array of valid keys. Then it walks through an array pulling out
values that have valid keys, and putting them in an array for processing
later. I have tried explicitly stating the variable scope.
abstract class parentclass
{
protected $vkeys= array('title1','title2','title3');
protected $a;
function __construct($set = NULL, $special = NULL)
{
self::$this-vkeys= array_merge(self::$this-vkeys, $special);
foreach($set as $key=$value)
{
if (in_array($key,self::$this-vkeys))
{
$this-a[$key] = $value;
}
}
print_r(self::$this-vkeys); //output below
print_r(self::$this-a); //output below
}
}
class childclass extends parentclass
{
protected $vkeys= array('titleA', 'titleB', 'TitleC');
function __construct($set, $special = NULL)
{
parent::__construct($set, self::$this-vkeys);
unset(self::$this-vkeys);
}
}
Unfortunately it seems to duplicate the child's array instead of appending.
Explicitly stating scope does not seem to help.
print_r(self::$this-vkeys);
Array (
[0] = titleA
[1] = titleB
[2] = titleB
[3] = titleA
[4] = titleB
[5] = titleB
)
print_r(self::$this-a);
Array()
Any thoughts?
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[PHP] variable scope in nested functions
Is there a way to access a variable defined in a function from a nested
function, without putting the variable in the global scope?
Perhaps some code will make my question clearer:
function enclosing() {
$variable1;
function enclosed() {
can I access $variable1 from here?
}
}
Thanks,
fbv
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[PHP] Variable scope
I have the following code:
?
function a($var_a)
{
b();
}
function b()
{
global $var_a;
echo $var_a;
}
a(hello word!);
?
why function b() don't echo anything? can I resolve this problem without
calling b($var_a)?
Best regards,
George Nicolae
IT Manager
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Re: [PHP] Variable scope
On Thursday 14 March 2002 21:53, George Nicolae wrote:
I have the following code:
?
function a($var_a)
{
b();
}
function b()
{
global $var_a;
echo $var_a;
}
a(hello word!);
?
why function b() don't echo anything?
Because $var_a has not, at any point, been defined in the global scope.
can I resolve this problem without
calling b($var_a)?
I'm curious as to what you're trying to achieve. Could you enlighten me?
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Open Source Software Systems Integrators
* Web Design Hosting * Internet Intranet Applications Development *
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Re: [PHP] Variable scope
Jason Wong [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]...
On Thursday 14 March 2002 21:53, George Nicolae wrote:
I have the following code:
?
function a($var_a)
{
b();
}
function b()
{
global $var_a;
echo $var_a;
}
a(hello word!);
?
why function b() don't echo anything?
Because $var_a has not, at any point, been defined in the global scope.
how i declare $var_a as global?
can I resolve this problem without
calling b($var_a)?
I'm curious as to what you're trying to achieve. Could you enlighten me?
I have a big(=many lines) function a() and a little one b(). I call
function b() from function a() and alsow from many other php files. I
need to midify the function b() without modify any other php files. That's
why I don't want to use b($var_a).
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Open Source Software Systems Integrators
* Web Design Hosting * Internet Intranet Applications Development *
/*
I will make no bargains with terrorist hardware.
-- Peter da Silva
*/
Best regards,
George Nicolae
IT Manager
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Re: [PHP] Variable scope
On Friday 15 March 2002 00:34, George Nicolae wrote:
Jason Wong [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]...
On Thursday 14 March 2002 21:53, George Nicolae wrote:
I have the following code:
?
function a($var_a)
{
b();
}
function b()
{
global $var_a;
echo $var_a;
}
a(hello word!);
?
why function b() don't echo anything?
Because $var_a has not, at any point, been defined in the global scope.
how i declare $var_a as global?
Strictly speaking, in php you don't. Any variable declared outside of a
function is what can be loosely called global. To access such variables
inside a function you must tell PHP you want to use the global version of
that variable.
$doo = 'dah';
$foo = 'bar';
a();
function a() {
global $doo;
echo $doo; # displays 'dah';
echo $fool # displays nothing.
}
In your code above, you haven't defined $var_a anywhere outside of a
function. Thus it is a local variable that only exists inside function a().
That is why function b() doesn't see it.
can I resolve this problem without
calling b($var_a)?
I'm curious as to what you're trying to achieve. Could you enlighten me?
I have a big(=many lines) function a() and a little one b(). I call
function b() from function a() and alsow from many other php files. I
need to midify the function b() without modify any other php files.
That's why I don't want to use b($var_a).
The easiest solution I can see right now is to explicitly define $var_a.
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Re: [PHP] Variable scope
On Thu, 14 Mar 2002, George Nicolae wrote:
?
function a($var_a)
{
b();
}
function b()
{
global $var_a;
echo $var_a;
}
a(hello word!);
?
why function b() don't echo anything?
Because $var_a has not, at any point, been defined in the global scope.
how i declare $var_a as global?
Define it somewhere within the global context (i.e., outside of any
function. Or do what you have done, refer to it in function b() with the
global keyword. But you can do that all day long and that won't make it
local to function a() unless you modify that function as well.
miguel
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[PHP] variable scope
I have a little chunk of code that checks to see if a variable exists and if
not then it sets it. It goes like this:
if (empty($page))
{
$page = login;
}
I then end that part of the php script after doing what I need to. Then I
start up again on the same html page and I assumed that $page had a value
assigned to it because of the above code, but it appears that it doesn't. Is
this supposed to happen or is something weird happening. I added that little
bit of code to the second chunk of code and it fixed the problem. Is that
the right way to do it? Is that variable only available in the ?php ?
that it's declared in? Thanks,
Dave
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Re: [PHP] variable scope
On Tue, 2002-03-12 at 14:38, David Johansen wrote:
I have a little chunk of code that checks to see if a variable exists and if
not then it sets it. It goes like this:
if (empty($page))
{
$page = login;
}
I then end that part of the php script after doing what I need to. Then I
start up again on the same html page and I assumed that $page had a value
assigned to it because of the above code, but it appears that it doesn't. Is
this supposed to happen or is something weird happening. I added that little
bit of code to the second chunk of code and it fixed the problem. Is that
the right way to do it? Is that variable only available in the ?php ?
that it's declared in? Thanks,
Dave
Shouldn't be. A variable is valid from the point it's declared until
it's unset(), or goes out of scope (the function within which it was
declared ends), or the script ends.
Can you provide a short script which exhibits this behaviour?
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Re: [PHP] variable scope
Something most have just been wigging out or something because I can't get
it to do it again. Maybe I just did something wrong, but it seems to be
working now. Thanks for the help though,
Dave
Lars Torben Wilson [EMAIL PROTECTED] wrote in message
1015973063.2146.82.camel@ali">news:1015973063.2146.82.camel@ali...
On Tue, 2002-03-12 at 14:38, David Johansen wrote:
I have a little chunk of code that checks to see if a variable exists
and if
not then it sets it. It goes like this:
if (empty($page))
{
$page = login;
}
I then end that part of the php script after doing what I need to. Then
I
start up again on the same html page and I assumed that $page had a
value
assigned to it because of the above code, but it appears that it
doesn't. Is
this supposed to happen or is something weird happening. I added that
little
bit of code to the second chunk of code and it fixed the problem. Is
that
the right way to do it? Is that variable only available in the ?php
?
that it's declared in? Thanks,
Dave
Shouldn't be. A variable is valid from the point it's declared until
it's unset(), or goes out of scope (the function within which it was
declared ends), or the script ends.
Can you provide a short script which exhibits this behaviour?
--
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[PHP] variable scope / preg_replace_callback question
Hi,
Does anyone know of a way of passing other variables to the function being called by
preg_replace_callback? For instance, I have the following code:
function smarty_compile_lang($tpl_source) {
// en.php contains a very large array, $_lang
include_once '/home/test/en.php';
global $_lang;
return preg_replace_callback('/##(.+?)##/', '_compile_lang', $tpl_source);
}
function _compile_lang($key){
// If I include $_lang here then it gets
// loaded again and again - bad for performance as it is _very_ large
return $_lang[$key[1]];
} // End _compile_lang
Somehow I need to make $_lang global, or pass it through the function
preg_replace_callback as an arguement for _compile_lang() - which I don't think is
possible?
What can I do? I've tried a global statement everywhere I can think of... and I don't
want to include en.php outside the functions, as it'll be included then whether the
templates are being compiled or not. I'm
guessing that I may want to look at a higher level of abstraction from these
functions, as even if I have the include in the current place, it means that every
time a template is compiled it gets reloaded (though that's
not as bad as every time preg_replace_callback() finds something) whereas the best way
would be to load it once per script invocation - and then only when the templates wer
being compiled...
Suggestions?
TIA,
Peter.
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Re: [PHP] variable scope / preg_replace_callback question
function _compile_lang($key){
global $_lang;
return $_lang[$key[1]];
} // End _compile_lang
HTH
Regards,
Andrey Hristov
- Original Message -
From: Peter Bowyer [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, December 03, 2001 3:45 PM
Subject: [PHP] variable scope / preg_replace_callback question
Hi,
Does anyone know of a way of passing other variables to the function being called by
preg_replace_callback? For instance, I have
the following code:
function smarty_compile_lang($tpl_source) {
// en.php contains a very large array, $_lang
include_once '/home/test/en.php';
global $_lang;
return preg_replace_callback('/##(.+?)##/', '_compile_lang', $tpl_source);
}
function _compile_lang($key){
// If I include $_lang here then it gets
// loaded again and again - bad for performance as it is _very_ large
return $_lang[$key[1]];
} // End _compile_lang
Somehow I need to make $_lang global, or pass it through the function
preg_replace_callback as an arguement for _compile_lang() -
which I don't think is possible?
What can I do? I've tried a global statement everywhere I can think of... and I
don't want to include en.php outside the
functions, as it'll be included then whether the templates are being compiled or not.
I'm
guessing that I may want to look at a higher level of abstraction from these
functions, as even if I have the include in the
current place, it means that every time a template is compiled it gets reloaded
(though that's
not as bad as every time preg_replace_callback() finds something) whereas the best
way would be to load it once per script
invocation - and then only when the templates wer being compiled...
Suggestions?
TIA,
Peter.
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[PHP] Variable scope problem
I have two functions like the ones below. If the first one creates a
variable as global, shouldn't it be accesible to the second function?
function setGlobal() {
global $test;
$test = "123";
}
function getGlobal() {
global $test;
echo $test;
}
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RE: [PHP] Variable scope problem
-Original Message-
From: Joe Nelson [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, March 28, 2001 6:17 PM
To: php list
Subject: [PHP] Variable scope problem
I have two functions like the ones below. If the first one creates a
variable as global, shouldn't it be accesible to the second function?
function setGlobal() {
global $test;
$test = "123";
}
function getGlobal() {
global $test;
echo $test;
}
Global doesn't CREATE global variables, it allows variables to be used as
globals. For example, in the above setup, you would do this instead:
function setGlobal() {
global $test;
$test = "123";
return $test;
}
$test = setGlobal();
function getGlobal() {
global $test;
echo $test;
}
And now, getGlobal will echo $test as:
123
Of course, if you are looking to create global variables in a single
function, then you simply would do something like this:
function setGlobal() {
global $test;
$test[0] = "123";
$test[1] = "456";
$test[2] = "789";
return $test;
}
and that would return the array $test, and therefore:
$test = setGlobal();
$test would be an array, and then you could set global in any function $test
and be able to use multiple values (as per the array). This is easier than
globaling 20 or so values you may need.
Jason Lotito
www.NewbieNetwork.net
Where those who can, teach;
and those who can, learn.
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[PHP] Variable scope
How do I make a variable persistent between webpages? V e r b a l -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP] Variable scope
-Original Message- From: Martin Skjoldebrand [mailto:[EMAIL PROTECTED]] Sent: Saturday, March 10, 2001 3:22 PM To: [EMAIL PROTECTED] Subject: [PHP] Variable scope How do I make a variable persistent between webpages? Take a look at the session functions described at: http://php.net/manual/en/ref.session.php -- Christian Jorgensen http://www.razor.dk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP] variable scope -- unsetting vars inside functions
When a function finishes execution does it automatically clean up its local
variables or should I manually unset() them? For example:
function do_something() {
$local_var = 'something really big...';
return true;
}
Does $local_var immediately vanish from existence when do_something finishes
executing?
Thanks!
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Director of Data Systems, wcities.com
ICQ: 35884415
:wq
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[PHP] Variable Scope
I'm a bit troubled with the fact that variables declared at the top of your script are not then global to functions within that script. That in order to see that variable within a function you'd have to declare it as global in the function (understanding that the variable could have been set at the top of the script). This seems extremely backwards to me (me being a VB guy). Would someone kindly shine the light down upon me with an explanation of this logic? And why can't I possibly declare the variable as Global at the top of my script? Thats a big "H" -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] Variable Scope
A nice explanation, via the mind of Lars Torben Wilson, exists here : http://marc.theaimsgroup.com/?l=php-generalm=97717398101040w=2 Also, you may want to check out : http://www.php.net/manual/en/language.constants.php http://www.php.net/manual/en/function.define.php Philip On Thu, 18 Jan 2001, Karl J. Stubsjoen wrote: I'm a bit troubled with the fact that variables declared at the top of your script are not then global to functions within that script. That in order to see that variable within a function you'd have to declare it as global in the function (understanding that the variable could have been set at the top of the script). This seems extremely backwards to me (me being a VB guy). Would someone kindly shine the light down upon me with an explanation of this logic? And why can't I possibly declare the variable as Global at the top of my script? Thats a big "H" -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] Variable Scope
How about allowing for metaPasses within the castle? Am sure this topic came up, what's the conclusion? Philip On Thu, 18 Jan 2001, Rasmus Lerdorf wrote: I'm a bit troubled with the fact that variables declared at the top of your script are not then global to functions within that script. That in order to see that variable within a function you'd have to declare it as global in the function (understanding that the variable could have been set at the top of the script). This seems extremely backwards to me (me being a VB guy). Would someone kindly shine the light down upon me with an explanation of this logic? And why can't I possibly declare the variable as Global at the top of my script? Once upon a time in a cold land far far away, a brave programming team was building a castle. The castle was large and complex with countless rooms and secret passageways. On one frightful day the team got stuck. They had built one too many rooms with one too many secret passageways and suddenly the castle was beginning to crumble. A desperate plea went out to the local wizard who was strong and powerful. The local wizard looked at the problem, saw the many rooms and the many secret passageways and gave the following decree: "Thou must post a sign in each and every room declaring which secret passageways connect to this room." The brave programming team feared the wizard and implemented the decree immediately although they really didn't understand how it would help. What they found was that a number of secret passageways did not connect to anything and others connected to places that didn't make any sense. After fixing these the castle was solid again. The moral of this tale is that one must declare ones' global variables that one intends to use within a function. In languages like C where this is not required one can end up with all sorts of weird side effects when a function changes a variable that the programmer intended to be local to the function and it affects code elsewhere in the system. This is almost impossible to track down. The tale of the brave programming team led to this being a requirement in PHP. -Rasmus -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] Variable Scope
I find the VB way (or VBScript anyway) of doing functions backwards.
My recollection is that if I call a function blah...
x = blahfunction('cow')
'blahfunction' itself has to be defined *in* the function to get the value
back. I can't even think of a good example, it's so foreign to me and I haven't
done much new vbscript in a while.
To get 'x' to equal something, you'd have to have a line in the blahfunction
that actually says
blahfunction='moo'
*That's* weird to me.
Anyway, not meant to be bashing, but you brought up VB.
What's helped me to think of globals in PHP is that I know variables defined in
the main area of the page work on that level. As I go deeper into the code
(down a level) into a function, if I need something from a level above, I have
to say GLOBAL $varname to make sure I get the varname I want. It's helped me
immensely over the last year, but mostly by making me do functions with argument
lists and return values, rather than modifying GLOBAL variables. My functions
are far more portable between projects than they were a few years ago.
"Karl J. Stubsjoen" wrote:
I'm a bit troubled with the fact that variables declared at the top of your
script are not then global to functions within that script. That in order
to see that variable within a function you'd have to declare it as global in
the function (understanding that the variable could have been set at the top
of the script). This seems extremely backwards to me (me being a VB guy).
Would someone kindly shine the light down upon me with an explanation of
this logic? And why can't I possibly declare the variable as Global at the
top of my script?
Thats a big "H"
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