3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace foo\bar; function get_declared_classes($in_namespace = null) { if ($in_namespace === null) { return \get_declared_classes(); } if ($in_namespace{0} == '\\') { $in_namespace = substr($in_namespace, 1); } if (substr($in_namespace, -1) != '\\') { $in_namespace .= '\\'; } $filter = new \RegexIterator(new \ArrayIterator(\get_declared_classes()), '/^' .\preg_quote($in_namespace). '.*$'); return \iterator_to_array($filter); } var_dump(get_declared_classes("foo\bar"));

preferences:
71.19 ms | 402 KiB | 5 Q