3v4l.org

run code in 300+ PHP versions simultaneously
<?php $it = new \ArrayIterator(array("foo", "bar", "baz")); $it2 = new \RegexIterator($it, "/^ba/", \RegexIterator::MATCH, \RegexIterator::INVERT_MATCH); print_r(iterator_to_array($it2));

preferences:
37.05 ms | 402 KiB | 5 Q