3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array_flip(['foo_bar', 'foo_baz', 'foo_bat', 'bar_baz', 'bar_bat', 'bat_bat']); var_export($array); echo "\n"; var_export(array_filter($array, function($k) { return strpos($k, "_bat") !== FALSE; }, ARRAY_FILTER_USE_KEY));

preferences:
48.21 ms | 402 KiB | 5 Q