<?php $a = array( '/foo/' => '1', '/foo' => '2', '/foo/bar/baz' => '3', '/foo/bar/b' => '4' ); function sort_keys_by_length_desc(array $a) { $lengths = array_map('strlen', array_keys($a)); $temp = $a; array_multisort($lengths, SORT_DESC, $temp); return $temp; } var_dump(sort_keys_by_length_desc($a));
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