3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [ 'Mary', 'Mary had a little', 'a lamb', 'Mary mary mary', 'lady' ]; var_export( array_count_values( explode(' ', strtolower( implode(' ', $array) ) ) ) );

preferences:
35.06 ms | 408 KiB | 5 Q