3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $keys = array(1,2,3); function foo($key) { return sprintf(':%s', $key); } $placeholders = array_map('foo', $keys); var_dump($keys);
based on tBvPL
Output for 4.3.0 - 7.2.0
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }