Learn how to simply restore short URLs (short links) in PHP

The example in this article describes how to simply implement short URL restoration in PHP. Share it with everyone for your reference, the details are as follows:

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The specific code is as follows:

<?php
$info1 = &#39;亲！暂不能解析此类短网址。&#39;;
$info2 = &#39;亲！网址解析失败，请重试。&#39;;
$info3 = &#39;<br/><b><a href="&#39;;
$info4 = &#39;" target="_blank">立即访问>></a></b>&#39;;
$info5 = &#39;亲！不是短网址或无效。&#39;;
function unshort($url)
{
global $info1,$info2,$info3,$info4;
 $curl = curl_init();
 curl_setopt($curl, CURLOPT_URL, $url);
 curl_setopt($curl, CURLOPT_RETURNTRANSFER,1);
 curl_setopt ($curl, CURLOPT_USERAGENT, &#39;Mozilla/8.0 (compatible; MSIE 8.0; Windows 7&#39;);
 curl_setopt($curl, CURLOPT_HEADER, 1);
 curl_setopt($curl, CURLOPT_NOBODY, 0);
 curl_setopt($curl, CURLOPT_TIMEOUT, 15);
 curl_setopt($curl,CURLOPT_ENCODING, &#39;gzip&#39;);
 $data = curl_exec($curl);
 if(!empty($data)){
 $message = curl_getinfo($curl);
  curl_close($curl);
   $status = $message[&#39;http_code&#39;];
   if ($status == &#39;301&#39; || $status == &#39;302&#39; ){
    $UrlHeader = (get_headers($url,1));
    $unurl = $UrlHeader[Location];
    if(is_array($unurl)) {
     $unurl = $unurl[0];
     $unurl .=$info3.$unurl.$info4;
     return $unurl;
     }
    else {
    $unurl .=$info3.$unurl.$info4;
    return $unurl;
    }
   }
  return $info1;
 }
 return $info2;
}
function adfunshort($url)
{
global $info3,$info4,$info5;
 $c = file_get_contents($url);
 $p = "/url = &#39;(.*)&#39;;/isU";
 preg_match($p, $c, $content);
 $unurl = $content[1];
 if($unurl == &#39;&#39;) {
  return $info5;
 }
 else {
  $unurl .=$info3.$unurl.$info4;
  return $unurl;
 }
}
?>
<form action="" method="post">
短网址：<input type="text" name="turl" class="inurl" size="26" />
<input type="hidden" name="url_done" value="done" />
<input type="submit" value="提交" class="suburl" />
</form>
<p id="trurl">
<?php
$turl = $_POST[&#39;turl&#39;]?$_POST[&#39;turl&#39;]:"";
$url_done= $_POST[&#39;url_done&#39;]?$_POST[&#39;url_done&#39;]:"";
if ($url_done == &#39;done&#39;){
$http = substr($turl,0,7);
 if ($http != &#39;http://&#39; && $http != &#39;https:/&#39;){
  $turl = &#39;http://&#39;.$turl;
  }
  $tturl = substr($turl,0,11);
  if ($tturl == &#39;http://adf.&#39;){
  $longurl = adfunshort($turl);
  }else {
  $longurl = unshort($turl);
 }echo "短网址 ".$turl." 的真实网址为：<br />$longurl ";
}
?>

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