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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