3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $data = array( 1 => 0, 2 => 0, 3 => 1, 7 => 1, 4 => 3, 5 => 4, 6 => 5, 8 => 5 ); print_r( array_keys($data, 1) );
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 3 [1] => 7 )
Output for hhvm-3.10.0

Process exited with code 153.