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<?php var_dump(array_udiff([0,1,2,3,4], [2,3,5], function($a, $b){ return $a <=> $b; }));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> int(0) [1]=> int(1) [4]=> int(4) }

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