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<?php function compare($a, $b) { echo("$a : $b\n"); return strcmp($a, $b); } $a = array('a', 'b', 'c'); $b = array('x', 'y', 'z'); var_dump(array_udiff($a, $b, 'compare'));
Output for git.master, git.master_jit, rfc.property-hooks
a : b b : c x : y y : z a : x a : b b : x b : c c : x array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" }

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