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<?php $items = array("abc", "cde"); $udiff = array_udiff($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 cde, result is Deprecated: array_udiff(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/g8ncf on line 6 Comparing cde to abc, result is Comparing abc to cde, result is Comparing cde to abc, result is Comparing abc to abc, result is 1 Comparing abc to cde, result is Comparing cde to abc, result is Comparing abc to cde, result is Comparing cde to abc, result is array(0) { }

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