php的URL重定向header()函数
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:'. $url);就可以了,如果要做像301定向我们还需要发送状态代码,下面整理了一些例子一起来看看吧。
<?php
// URL重定向
function redirect($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 {
$str = "<meta http-equiv='Refresh' content='{$time};URL={$url}'>";
if ($time != 0) $str.= $msg;
exit($str);
}
}
//url重定向2
function redirect($url) {
echo "<script>" . "function redirect() {window.location.replace('$url');}\n" . "setTimeout('redirect();', 1000);\n" . "</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:
<?php
$url = "www.phprm.com";
if (!empty($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
<?php
/**
* 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/1.1\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;
}
}
/**
* 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;
}
}
?>教程链接:http://www.phprm.com/code/62409.html
随意转载~但请保留教程地址★