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// URL重定向 function redirect($url, $time=0, $msg=”) { //多行URL地址支持 $url = str_replace(array(“\n”, “\r”), ”, $url); if ( empty($msg) ) $msg = “系统将在{$time}秒之后自动跳转到{$url}!”; if (!headers_sent()) { // redirect if (0 === $time) { header(‘Location: ‘ . $url); } else { header(“refresh:{$time};url={$url}”); echo($msg); } exit(); } else { $str = “”; if ($time != 0) $str .= $msg; exit($str); } } //url重定向2 function redirect($url) { echo “ ”; exit(); } |
用HTTP头信息
也就是用PHP的HEADER函数。PHP里的HEADER函数的作用就是向浏览器发出由HTTP协议规定的本来应该通过WEB服务器的控制指令，例如声明返回信息的类型("Context-type: xxx/xxx")，页面的属性("No cache", "Expire")等等。
用HTTP头信息进行PHP重定向到另外一个页面的方法如下：
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<?php $url = "www.111cn.net"; if (!empty($url)) { Header("HTTP/1.1 303 See Other"); //这条语句可以不写 Header("Location: $url"); } ?> |
注意一下，"Localtion:"后面有一个空格，下面整理了一个全面的函数。
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/** * get_redirect_url() * Gets the address that the provided URL redirects to, * or FALSE if there's no redirect. * * @param string $url * @return string */ function get_redirect_url($url){ $redirect_url = null; $url_parts = @parse_url($url); if (!$url_parts) return false; if (!isset($url_parts['host'])) return false; //can't process relative URLs 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/1.1rn"; $request .= 'Host: ' . $url_parts['host'] . "rn"; $request .= "Connection: Closernrn"; fwrite($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; } } /** * get_all_redirects() * Follows and collects all redirects, in order, for the given URL. * * @param string $url * @return array */ function get_all_redirects($url){ $redirects = array(); while ($newurl = get_redirect_url($url)){ if (in_array($newurl, $redirects)){ break; } $redirects[] = $newurl; $url = $newurl; } return $redirects; } /** * get_final_url() * Gets the address that the URL ultimately leads to. * Returns $url itself if it isn't a redirect. * * @param string $url * @return string */ function get_final_url($url){ $redirects = get_all_redirects($url); if (count($redirects)>0){ return array_pop($redirects); } else { return $url; } } |