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

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