php header头怎么实现跳转

void header (string string [,bool replace [,int http_response_code]])

<?php 
 //重定向浏览器 
header("Location: https://www.jb51.net"); 
 //确保重定向后，后续代码不会被执行 
exit;
?>

<?php 
$url = $_GET['url'];
Header("Location:$url");
?>

if($_COOKIE["u_type"]){ header('location:register.php'); } else{ setcookie('u_type','1','86400*360');//设置cookie长期有效 header('location:zc.html');

// 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);
 }
 }

function getref()
 {
 $url = @$_SERVER['HTTP_REFERER'];
 if( !empty( $url ) )
 {
 if( !strstr($url ,'jb51.net' ) && !strstr($url,'jb51.net'))
 {
 @header("http/1.1 404 not found");
 @header("status: 404 not found");
 include("404.html");//跳转到某一个页面，推荐使用这种方法
 exit();
 }
 }
 else
 {
 @header("http/1.1 404 not found");
 @header("status: 404 not found");
 include("404.html");//跳转到某一个页面，推荐使用这种方法
 exit();
 }
 }

<?php 
 $the_host = $_SERVER['HTTP_HOST'];
 $request_uri = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '';
 if($the_host !== 'www.jb51.net')
 {
  //echo $_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];
  header('HTTP/1.1 301 Moved Permanently');
  header('Location: https://www.jb51.net' . $_SERVER['PHP_SELF'] . $request_uri);
 }
 ?>