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<?php function generateRandomString($length = 22) { return substr(str_shuffle(str_repeat($x = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', ceil($length / strlen($x)))), 1, $length); } $generated = []; for ($i = 0; $i < 1000000; $i++) { $generated[] = generateRandomString(); } var_dump(count(array_unique($generated)));
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