How to use php function to generate short domain name

Short URLs have been popular for a while. I had been exposed to it when I was working on the Sina Weibo application, but I didn’t understand it. Recently, I came into contact with this thing again. After studying it carefully, I found that shortening URLs is actually quite easy. of. Next, we will record the implementation method of using php to generate short URLs.

php generate short domain name function

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 * &#39;0x&#39; . $hex_num);
      $n = $num % $strlen;
      $code .= $hex_code[$n];
    }
 
    return $code;
  }

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