3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $ar = array('a' => 'b'); function cb($v) { return $v; } function keys($v, $k) { return $k; } print_r(array_map('cb', $ar)); $keys = array_map('keys', $ar, array_keys($ar)); print_r(array_map('cb', $ar, $keys));
based on 6ljW4
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [a] => b ) Array ( [0] => b )