3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s = "ab"; $s1 = "cAbfAbe"; $s2 = stristr($s1,$s); echo $s2; echo substr($s2,0,count($s)+1); echo "\n"; echo str_ireplace($s,$s,$s1);

preferences:
31.49 ms | 402 KiB | 5 Q