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<?php $arr = array(array("lol"=>"lol1", "text"=>"Haha"), array("lol"=>"lol2", "text"=>"Heheh")); $assoc_arr = array_reduce($arr, function ($result, $item) { $result[$item["lol"]][] =$item["lol"]; return $result; }, array()); var_dump($assoc_arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["lol1"]=> array(1) { [0]=> string(4) "lol1" } ["lol2"]=> array(1) { [0]=> string(4) "lol2" } }

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