php的URL重定向header()函数-PHP源码-php.cn

php的URL重定向header()函数

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Release： 2016-06-08 17:22:00

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URL重定向我们会使用到header函数来操作，最简单的就是直接使用header(‘Location: ‘ . $url);就可以了，如果要做像301定向我们还需要发送状态代码，下面整理了一些例子一起来看看吧。

代码如下

复制代码

// 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($url) {
echo “<script>”.<br /> “function redirect() {window.location.replace(‘$url’);}＼n”.<br /> “setTimeout(‘redirect();’, 1000);＼n”.<br /> “</script>”;
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：

代码如下	复制代码
$url = "www.111cn.net"; if (!empty($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

代码如下

复制代码

/**
* 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;
}
}