3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(E_ALL); $foo = array( 'foo' => 'oof' ); if (!isset($foo['sub']['arrays']['are']['pretty']['cool'])) { $foo['sub']['arrays']['are']['pretty']['cool'] = 0; } print_r($foo); ?>
Output for 4.3.0 - 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, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [foo] => oof [sub] => Array ( [arrays] => Array ( [are] => Array ( [pretty] => Array ( [cool] => 0 ) ) ) ) )
preferences:
242.23 ms | 406 KiB | 366 Q