3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 'foo'; $temporaryA = $a; $a = md5('value for finding ' . uniqid()); $variables = get_defined_vars(); $key = array_search($a, $variables, true); var_dump($key); $a = $temporaryA; unset ($temporaryA);
Output for 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 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1
string(1) "a"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
Warning: uniqid() expects at least 1 parameter, 0 given in /in/F0gDW on line 7 string(1) "a"
preferences:
218.06 ms | 401 KiB | 325 Q