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<?php $arr = ["prefix" => "a", "children" => ["prefix" => "b", "children" => ["prefix" => "c", "children" => []]]]; function getPrefix($v, $k) { global $ps; if ($k == "prefix") $ps[] = $v; } array_walk_recursive($arr, 'getPrefix'); print_r($ps); echo implode("/", $ps);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => a [1] => b [2] => c ) a/b/c

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