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<?php $items = array("abc"); $udiff = array_udiff($items, $items, function ($a, $b) { $result = $a === $b; print("Comparing $a to $b, result is $result\n"); return $result; }); var_dump($udiff);
Output for git.master, git.master_jit, rfc.property-hooks
Comparing abc to abc, result is 1 Deprecated: array_udiff(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/gGn62 on line 6 array(1) { [0]=> string(3) "abc" }

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