title: PHP Convert int to HEX
body: <p>How can I get a similar function with pack/unpack (or other short function)?</p>
  
  <pre><code>function getHEX($number) {
      switch($number) {
          case 0: $ret = "\x00\x00\x00\x00"; break;
          case 1: $ret = "\x00\x00\x00\x01"; break;
          case 2: $ret = "\x00\x00\x00\x02"; break;
          case 3: $ret = "\x00\x00\x00\x03"; break;
          // (...)
  
          default: $ret = "\x00\x00\x00\x00";
      }
  
      return $ret;
  }
  </code></pre>