3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = explode('/', '/Albums/album_id/Photos/photo_id/tags'); foreach($arr as &$a) { if(strpos($a, '_') !== false) { $a = str_replace(" ", "", ucwords(str_replace("_", " ", $a))); } } echo implode('/', $arr);

preferences:
34.57 ms | 408 KiB | 5 Q