php的URL重新導向header()函數

// URL重新導向 function redirect($url, $time=0, $msg=”) { //多行URL地址支援 $url = str_replace(array(“\n”, “\r”), ”, $url); if ( empty($msg) ) $msg = “系統將在{$time}秒之後自動跳轉到{$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重新導向2 function redirect($url) { echo “ ”; exit(); }

用HTTP頭資訊

也就是用PHP的HEADER函數。PHP裡的HEADER函數的作用就是向瀏覽器發出由HTTP協議規定的本來應該通過WEB伺服器的控制指令，例如聲明返回資訊的類型("Context-type: xxx/xxx")，頁面的屬性("No cache", "Expire")等等。

用HTTP頭資訊進行PHP重新導向到另外一個頁面的方法如下：

<?php $url = "www.111cn.net"; if (!empty($url)) { Header("HTTP/1.1 303 See Other"); //這條語句可以不寫 Header("Location: $url"); } ?>

注意一下，"Localtion:"後面有一個空格，下面整理了一個全面的函數。

/** * 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; } }