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<?php $sum = null; // global variable $sum2 = null; // global variable function outer() { global $sum; global $sum2; $hundred_more = 100; $sum = function ($a, $b) use (&$hundred_more) { return $a + $b + (++$hundred_more); }; $sum2 = function ($a, $b) use (&$hundred_more) { return $a + $b + (++$hundred_more); }; var_dump($hundred_more); } outer(); // define sum at the global scope and print 100 var_dump($sum(5, 10)); // 116 var_dump($sum(5, 10)); // 116 var_dump($sum2(5, 10)); // 116 var_dump($sum2(5, 10)); // 116 outer(); // redefine sum at the global scope and print 100 var_dump($sum(5, 10)); // 116 var_dump($sum(5, 10)); // 116 var_dump($sum2(5, 10)); // 116 var_dump($sum2(5, 10)); // 116