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<?php $array=[[8,9,7],[7,8,9,33,21],[11,12,33,21,9,31]]; $unique=preg_match_all('~\b(\d+)\b(?!.*\b\1\b)~',json_encode($array),$out)?$out[0]:[]; sort($unique); var_export($unique);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '7', 1 => '8', 2 => '9', 3 => '11', 4 => '12', 5 => '21', 6 => '31', 7 => '33', )

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