3v4l.org

run code in 500+ PHP versions simultaneously
<?php $first = [ 'm' => 'n', ]; $second = [ 'm' => 'N', 'M' => 'n', ]; // wtf? var_export( array_diff_uassoc($first, $second, 'strcasecmp') );
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
array ( 'm' => 'n', )

preferences:
56.4 ms | 867 KiB | 4 Q