[edit] Last updated: Fri, 25 May 2012

$GLOBALS

(PHP 4, PHP 5)

$GLOBALS — References all variables available in global scope

Descrierea

An associative array containing references to all variables which are currently defined in the global scope of the script. The variable names are the keys of the array.

Exemple

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();
?>

Exemplul de mai sus va afișa ceva similar cu:

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

Note

Notă:
Aceasta este o variabilă 'superglobală', sau globală automată. Aceasta pur și simplu înseamnă că ea este disponibilă în toate circumstanțele pe parcursul script-ului. Nu este nevoie de a scrie global $variable; pentru a o accesa din funcții sau metode.

Notă: Variable availability

Unlike all of the other superglobals, $GLOBALS has essentially always been available in PHP.

$_SERVER

Superglobals

[edit] Last updated: Fri, 25 May 2012

add a note User Contributed Notes $GLOBALS

Gratcy 13-May-2012 01:03


this is technique that i always did for configuration file..



<?php

$conf['conf']['foo'] = 'this is foo';

$conf['conf']['bar'] = 'this is bar';



function foobar() {

    global $conf;

    var_dump($conf);

}



foobar();



/*

result is..



array

  'conf' => 

    array

      'foo' => string 'this is foo' (length=11)

      'bar' => string 'this is bar' (length=11)



*/

?>

therandshow at gmail dot com 29-Jun-2011 12:32


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.

williams at 3cisd dot com 28-Jul-2009 09:53


Better yet, use print_r.  While var_dump does detect the recursion that var_export fails on, it seems to recurse one level first for my setup.  So var_dump ends up printing all globals twice, but print_r prints them only once since it detects the recursion right away.  Serialize seems to not detect the recursion at all either, similar to var_export.

David 13-Aug-2008 11:47


Though you can use var_dump to output the value of $GLOBALS.

ravenswd at yahoo dot com 12-Aug-2008 07:02


Keep in mind that $GLOBALS is, itself, a global variable. So code like this won't work:



<?php

    print '$GLOBALS = ' . var_export($GLOBALS, true) . "\n";

?>



This results in the error message: "Nesting level too deep - recursive dependency?"

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