3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = "pomo"; $pos = 2; $str_to_replace = "aa"; $new_str = substr($str, 0, ($pos-1)).$str_to_replace.substr($str, $pos); echo $new_str;
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
paamo