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<?php function key_compare_func($a, $b) { var_dump($a, $b); if ($a === $b) { return 0; } return ($a > $b)? 1:-1; } $array1 = array("a" => "green", "b" => "brown", "c" => "red"); $array2 = array("a" => "green", "yellow", "red"); $result = array_diff_uassoc($array1, $array2, "key_compare_func"); die; print_r($result);

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