3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo strtolower("This is an UTF-8 string, containing ÆØÅ ИЕ and will not be lowered")."\n"; echo mb_strtolower("This is an UTF-8 string, containing ÆØÅ ИЕ and will be lowered");

preferences:
26.49 ms | 405 KiB | 5 Q