3v4l.org

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<?php $items = array("abc", "cde", "xyz"); $udiff = array_udiff($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/UvIdl on line 6 Comparing cde to abc, result is Comparing cde to xyz, result is Comparing xyz to cde, result is Comparing abc to cde, result is Comparing cde to abc, result is Comparing cde to xyz, result is Comparing xyz to cde, 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 Comparing cde to xyz, result is Comparing xyz to cde, result is array(0) { }

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