PHP如何实现生成特定长度的随机字符串？

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phpPHP生成随机字符串函数function RandomToken($length=32){ if (!isset($length) || intval($length)==8) { $length=32; } if (function_exists('openssl_random_pseudo_bytes')) { return bin2hex(openssl_random_pseudo_bytes($length)); }}

function RandomToken($length = 32){ if(!isset($length) || intval($length) <= 8 ){ $length = 32; } if (function_exists('openssl_random_pseudo_bytes')) { return bin2hex(openssl_random_pseudo_bytes($length)); } if (function_exists('random_bytes')) { return bin2hex(random_bytes($length)); } if (function_exists('mcrypt_create_iv')) { return bin2hex(mcrypt_create_iv($length, MCRYPT_DEV_URANDOM)); } $rand = ''; for($i = 0, $num = ceil($length/32) * 2;$i<=$num;$i++){ $rand .= md5(uniqid()); } return substr($rand,0,$length*2); }