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<?php $clashes = [ [ "s1_id" => 26, "s2_id" => 27 ], [ "s1_id" => 27, "s2_id" => 27 ] ]; array_walk($clashes, function (&$item, $key) { $item = array_unique($item); }, array()); var_dump($clashes);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(2) { ["s1_id"]=> int(26) ["s2_id"]=> int(27) } [1]=> array(1) { ["s1_id"]=> int(27) } }

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