3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "aeiou"; $c = 0; for($i = 0; $i < strlen($str); $i++) { if(in_array(substr($str,$i,1),array("a","e","i","o","u"))) $c++; } echo $c;

preferences:
41.9 ms | 402 KiB | 5 Q