php生成短域名函数

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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