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) ) ) ) );
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array ( 'mary' => 5, 'had' => 1, 'a' => 2, 'little' => 1, 'lamb' => 1, 'lady' => 1, )
preferences:
126.62 ms | 403 KiB | 227 Q