3v4l.org

run code in 300+ PHP versions simultaneously
<?php $result = 'get_array_log'; echo preg_replace_callback( '#([a-zA-Z])(?=[A-Z])#', function( array $matches ) { print_r( $matches ); exit; return ''; }, $result );

preferences:
56.16 ms | 402 KiB | 5 Q