How to get the url after jump in php?

php method to get the jump url: 1. Use the get_headers function to get the url after the jump. This function can get all the headers sent by the server in response to an HTTP request; 2. Use the fsockopen() function; 3. Use the cURL function.

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Sometimes we will encounter problems during development. In the case of URL 301 or 302 redirection, we may need to obtain the URL after redirection. Here we introduce several methods to obtain the redirection URL:

1. Use the get_headers function

php's own get_headers function can get all the headers sent by the server in response to an HTTP request. We can try to use this function to implement it.

function get_redirect_url($url){
   $header = get_headers($url, 1);
   if (strpos($header[0], ’301′) !== false || strpos($header[0], ’302′) !== false) {
     if(is_array($header['Location'])) {
       return $header['Location'][count($header['Location'])-1];
     }else{
       return $header['Location'];
        }
   }else {
     return $url;
   }
 }

2. Use the fsockopen() built-in function

function get_redirect_url($url){
   $redirect_url = false;
   $url_parts = @parse_url($url);
   if (!$url_parts) return false;
   if (!isset($url_parts['host'])) return false;
   if (!isset($url_parts['path'])) $url_parts['path'] = ‘/’;
   $sock = fsockopen($url_parts['host'], (isset($url_parts['port']) ?   (int)$url_parts['port'] : 80), $errno, $errstr, 30);
   if (!$sock) return false;
  $request = “HEAD ” . $url_parts['path'] . (isset($url_parts['query']) ? ‘?’.$url_parts['query'] : ”) . ” HTTP/1.1\r\n”;
   $request .= ‘Host: ‘ . $url_parts['host'] . “\r\n”;
   $request .= “Connection: Close\r\n\r\n”;
   fwrite($sock, $request);
   $response = ”;
   while(!feof($sock)) $response .= fread($sock, 8192);
   fclose($sock);
  if (preg_match(‘/^Location: (.+?)$/m’, $response, $matches)){
     return trim($matches[1]);
   } else {
    return false;
  }
}

3. Use the cURL function

function get_redirect_url($url, $referer=”, $timeout = 10) {
   $redirect_url = false;
   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $url);
   curl_setopt($ch, CURLOPT_HEADER, TRUE);
   curl_setopt($ch, CURLOPT_NOBODY, TRUE);//不返回请求体内容
   curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);//允许请求的链接跳转
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
   curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
   curl_setopt($ch, CURLOPT_HTTPHEADER, array(
      ‘Accept: */*’,
      ‘User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)’,
      ‘Connection: Keep-Alive’));
   if ($referer) {
     curl_setopt($ch, CURLOPT_REFERER, $referer);//设置referer
   }
   $content = curl_exec($ch);
   if(!curl_errno($ch)) {
     $redirect_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);//获取最终请求的url地址
   }
   return $redirect_url;
}

Which method is more effective? You can test it yourself.

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