3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $keys = array(1,2,3); function foo($key) { return sprintf(':%s', $key); } $placeholders = array_map('foo', $keys); var_dump($placeholders);
based on ot7OS
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(2) ":1" [1]=> string(2) ":2" [2]=> string(2) ":3" }