学习php简单实现短网址(短链)还原的方法

本文实例讲述了php简单实现短网址还原的方法。分享给大家供大家参考，具体如下：

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具体代码如下：

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

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