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<?php
/**
* @throws Exception
*/
function random($length = 13): string {
if (function_exists("random_bytes")) {
$bytes = random_bytes(ceil($length / 2));
} elseif (function_exists("openssl_random_pseudo_bytes")) {
$bytes = openssl_random_pseudo_bytes(ceil($length / 2));
} else {
throw new Exception("No cryptographically secure random function available");
}
return substr(bin2hex($bytes), 0, $length);
}
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