php生成短域名函数

public function createRandCode($string) { $code = ''; $hex_code = '1qaz2wsx3edc4rfv5t-gb6yhn7ujm8ik9ol0p_'; $now = microtime(true) * 10000; $strlen = strlen($hex_code); $hash_code = hash('sha256', $string); // 这里会为编码定义一个随机的长度，长度取决于step $step = rand(8, 16); $count = ceil(strlen($hash_code) / $step); for($i = 0; $i < $count; $i++) { $start = $i * $step; $hex_num = substr($hash_code, $start, $step); $num = 0x3fffffff & (1 * '0x' . $hex_num); $n = $num % $strlen; $code .= $hex_code[$n]; } return $code; }

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