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<?php $a= [['a', 10], ['b', 11], ['c', 12], ['d', 13]]; $b = [['k', 21], ['l', 22], ['m', 23]]; $diff = array_udiff($a, $b, function($o1, $o2) { echo 'comparing ' . $o1[0] . ', ' . $o2[0] . '\n'; return $o1[1] - $o2[1]; }); var_dump($diff);
Output for git.master, git.master_jit, rfc.property-hooks
comparing a, b\ncomparing b, c\ncomparing c, d\ncomparing k, l\ncomparing l, m\ncomparing a, k\ncomparing a, b\ncomparing b, k\ncomparing b, c\ncomparing c, k\ncomparing c, d\ncomparing d, k\narray(4) { [0]=> array(2) { [0]=> string(1) "a" [1]=> int(10) } [1]=> array(2) { [0]=> string(1) "b" [1]=> int(11) } [2]=> array(2) { [0]=> string(1) "c" [1]=> int(12) } [3]=> array(2) { [0]=> string(1) "d" [1]=> int(13) } }

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