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<?php class C { } $items = array(1, 1); $udiff = array_udiff($items, $items, function ($a, $b) { $result = $a === $b; print($result."\n"); return $result; }); var_dump($udiff);
Output for git.master, git.master_jit, rfc.property-hooks
1 Deprecated: array_udiff(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/DV6VE on line 8 1 1 1 1 array(2) { [0]=> int(1) [1]=> int(1) }

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