<?php function closure() { $a = 0; return function () use (&$a) { return $a++; }; } $c = closure(); var_dump($c()); var_dump($c()); var_dump($c()); var_dump($c()); var_dump($c()); $factorial = function ($n) use (&$factorial) { if ($n < 2) return 1; return $n * $factorial($n - 1); } var_dump($factorial(5));
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