3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo($data){ $data['foo'] = 'Bar!'; } foo($GLOBALS); var_dump($GLOBALS['foo']); foo($_GET); var_dump($_GET);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined global variable $foo in /in/ccbhC on line 8 NULL array(0) { }
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
string(4) "Bar!" array(0) { }
Output for 4.3.0 - 4.3.1
string(4) "Bar!" array(1) { ["/in/ccbhC"]=> string(0) "" }
preferences:
234.69 ms | 401 KiB | 359 Q