Forum PHP 2017

$GLOBALS

$GLOBALSتمام متغیرهای موجود در حوزه جهانی را پوشش می‌دهد

Description

یک array شرکت‌پذیر که شمال ارجاع به تمام متغیرهای موجود در حوزه جهانی این اسکریپت است. نام متغیرها کلید این آرایه است.

Examples

Example #1 $GLOBALS example

<?php
function test() {
    
$foo "local variable";

    echo 
'$foo in global scope: ' $GLOBALS["foo"] . "\n";
    echo 
'$foo in current scope: ' $foo "\n";
}

$foo "Example content";
test();
?>

The above example will output something similar to:

$foo in global scope: Example content
$foo in current scope: local variable

Notes

Note:

This is a 'superglobal', or automatic global, variable. This simply means that it is available in all scopes throughout a script. There is no need to do global $variable; to access it within functions or methods.

Note: وجود متغیرها

برخلاف دیگر superglobals $GLOBALS همیشه در PHP حاضر بوده است.

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User Contributed Notes 4 notes

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22
mstraczkowski at gmail dot com
4 years ago
Watch out when you are trying to set $GLOBALS to the local variable.

Even without reference operator "&" your variable seems to be referenced to the $GLOBALS

You can test this behaviour using below code

<?php
/**
* Result:
* POST: B, Variable: C
* GLOBALS: C, Variable: C
*/

// Testing $_POST
$_POST['A'] = 'B';

$nonReferencedPostVar = $_POST;
$nonReferencedPostVar['A'] = 'C';

echo
'POST: '.$_POST['A'].', Variable: '.$nonReferencedPostVar['A']."\n\n";

// Testing Globals
$GLOBALS['A'] = 'B';

$nonReferencedGlobalsVar = $GLOBALS;
$nonReferencedGlobalsVar['A'] = 'C';

echo
'GLOBALS: '.$GLOBALS['A'].', Variable: '.$nonReferencedGlobalsVar['A']."\n\n";
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20
therandshow at gmail dot com
5 years ago
As of PHP 5.4 $GLOBALS is now initialized just-in-time. This means there now is an advantage to not use the $GLOBALS variable as you can avoid the overhead of initializing it. How much of an advantage that is I'm not sure, but I've never liked $GLOBALS much anyways.
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2
vittorio.zamparella at famous googlemail
8 months ago
I finally found information about superglobals not being found in $GLOBALS:

https://bugs.php.net/bug.php?id=65223&edit=2
-------------------------------------
[2013-07-09 12:00 UTC] johannes @php.net
[...]super-globals (aka. auto globals) are not added to symbol tables by default for performance reasons unless the parser sees need. i.e.

<?php
$_SERVER
;
print_r($GLOBALS);
?>

will list it. You can also control this using auto_gloals_jit in php.ini: http://www.php.net/manual/en/ini.core.php#ini.auto-globals-jit
-------------------------------------

http://www.php.net/manual/en/language.variables.variable.php
-------------------------------------
Warning
Please note that variable variables cannot be used with PHP's Superglobal arrays within functions or class methods. The variable $this is also a special variable that cannot be referenced dynamically.
-------------------------------------
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3
stevenjeffries at gmail dot com
1 year ago
I ran into the case where I needed to know if my script was in the global scope or not.

You can use $GLOBALS to figure out which case that is:

<?php // file foo.php

$some_unique_prefix_foo = "ok";
if (isset(
$GLOBALS["some_unique_prefix_foo"])) {
    echo
"Foo is in global scope.\n";
} else {
    echo
"Foo is NOT in global scope.\n";
}
unset(
$some_unique_prefix_foo);

// Inside another file.
function test() {
    include
"foo.php";
}
test();

?>

Outputs:

Foo is in global scope.
Foo is NOT in global scope.
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