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run code in 300+ PHP versions simultaneously
<?php ob_start(); var_dump(array('controller' => 'index', 'action' => 'index', 'password' => 'h@x0r', 'login' => 'haxor@leet')); echo preg_replace('/\s+/', ' ' , ob_get_clean());
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 - 5.5.38, 5.6.0 - 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, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(4) { ["controller"]=> string(5) "index" ["action"]=> string(5) "index" ["password"]=> string(5) "h@x0r" ["login"]=> string(10) "haxor@leet" }

preferences:
292.66 ms | 406 KiB | 399 Q