php的URL重定向header()函数
// 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：
$url = "www.jiaochengji.com";
if (!empty($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
<table width="620" align="center" border="0" cellpadding="1" cellspacing="1" style="background:#FB7"> <tr> <td width="464" height="27" bgcolor="#FFE7CE"> 代码如下</td> <td width="109" align="center" bgcolor="#FFE7CE" style="cursor:pointer;" onclick="doCopy('copy7838')">复制代码</td> </tr> <tr> <td height="auto" colspan="2" valign="top" bgcolor="#FFFFFF" style="padding:10px;" class="copyclass" id=copy7838>/**
* 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;
}
}
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