3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $s = array("apple"=>"red", "banana"=>"yellow"); echo array_keys($s);
based on Td3sB
Output for 5.4.0 - 7.2.0
Notice: Array to string conversion in /in/GCUn5 on line 3 Array
Output for 4.3.0 - 5.3.29
Array