使用PHP header进行页面跳转出现的问题解疑
我们在进行页面跳转的时候,通常会用到
在PHP中用header("location:test.php")进行跳转要注意以下几点,有助于解决一些新手经常遇到的问题
1、location和“:”号间不能有空格,否则会出错。
2、在用header前不能有任何的输出。
3、header后的PHP代码还会被执行。
下面是和asp中重定向response.redirect的比较:
例1:
response.redirect "../test.asp"
header("location:../test.php");
两者区别:
asp的redirect函数可以在向客户发送头文件后起作用.
如
<ol class="dp-xml"> <li class="alt"><span><span class="tag"><span class="tag-name">html</span><span class="tag">></span><span class="tag"><span class="tag-name">head</span><span class="tag">></span><span class="tag"><span class="tag-name">head</span><span class="tag">></span><span class="tag"><span class="tag-name">body</span><span class="tag">></span><span> </span></span></span></span></span></span></li> <li><span class="tag"><span>%response.redirect "../test.asp"%</span><span class="tag">></span><span> </span></span></li> <li class="alt"><span class="tag"><span class="tag-name">body</span><span class="tag">></span><span class="tag"><span class="tag-name">html</span><span class="tag">></span><span> </span></span></span></li> </ol>
查是php中下例代码会报错:
<ol class="dp-xml"> <li class="alt"><span><span class="tag"><span> </span><span class="tag-name">html</span><span class="tag">></span><span class="tag"><span> </span><span class="tag-name">head</span><span class="tag">></span><span class="tag"><span> /head</span><span class="tag">></span><span class="tag"><span> </span><span class="tag-name">body</span><span class="tag">></span><span> </span></span></span></span></span></span></li> <li> <span class="tag"></span><span> </span> </li> <li class="alt"> <span class="tag-name">header</span><span>("location:../test.php"); </span> </li> <li> <span class="tag">?></span><span> </span> </li> <li class="alt"><span class="tag"><span> /body</span><span class="tag">></span><span class="tag"><span> /html</span><span class="tag">></span><span> </span></span></span></li> <li><span>只能这样: </span></li> <li class="alt"><span class="tag"><span> ? </span></span></li> <li><span>header("location:../test.php"); </span></li> <li class="alt"> <span class="tag">?></span><span> </span> </li> <li><span class="tag"><span> </span><span class="tag-name">html</span><span class="tag">></span><span class="tag"><span> </span><span class="tag-name">head</span><span class="tag">></span><span class="tag"><span> /head</span><span class="tag">></span><span class="tag"><span> </span><span class="tag-name">body</span><span class="tag">></span><span>...</span><span class="tag"><span> /body</span><span class="tag">></span><span class="tag"><span> /html</span><span class="tag">></span><span> </span></span></span></span></span></span></span></li> </ol>
即PHP header之前不能向客户发送任何数据.
例2:
asp中
<ol class="dp-xml"> <li class="alt"><span><span class="tag"><span> </span><span class="tag-name">html</span><span class="tag">></span><span class="tag"><span> </span><span class="tag-name">head</span><span class="tag">></span><span class="tag"><span> /head</span><span class="tag">></span><span class="tag"><span> </span><span class="tag-name">body</span><span class="tag">></span><span> </span></span></span></span></span></span></li> <li><span class="tag"><span>% </span></span></li> <li class="alt"><span>response.redirect "../a.asp" </span></li> <li><span>response.redirect "../b.asp" </span></li> <li class="alt"> <span>%</span><span class="tag">></span><span> </span> </li> <li><span class="tag"><span> /body</span><span class="tag">></span><span class="tag"><span> /html</span><span class="tag">></span><span> </span></span></span></li> <li class="alt"><span>结果是重定向a.asp文件. </span></li> <li><span>php呢? </span></li> <li class="alt"><span class="tag"><span> ? </span></span></li> <li><span>header("location:../a.php"); </span></li> <li class="alt"><span>header("location:../b.php"); </span></li> <li> <span class="tag">?></span><span> </span> </li> <li class="alt"><span class="tag"><span> </span><span class="tag-name">html</span><span class="tag">></span><span class="tag"><span> </span><span class="tag-name">head</span><span class="tag">></span><span class="tag"><span> /head</span><span class="tag">></span><span class="tag"><span> </span><span class="tag-name">body</span><span class="tag">></span><span class="tag"><span> /body</span><span class="tag">></span><span class="tag"><span> /html</span><span class="tag">></span><span> </span></span></span></span></span></span></span></li> </ol>
我们发现它重定向b.php.
原来在asp中执行redirect后不会再执行后面的代码.
而php在执行header后,继续执行下面的代码.
在这方面上php中的header重定向不如asp中的重定向.有时我们要重定向后,不能执行后面的代码:
一般地我们用
<ol class="dp-xml"> <li class="alt"><span><span>if(...) </span></span></li> <li><span>header("..."); </span></li> <li class="alt"><span>else </span></li> <li><span>{ </span></li> <li class="alt"><span>... </span></li> <li><span>} </span></li> </ol>
但是我们可以简单的用下面的PHP header方法:
<ol class="dp-xml"> <li class="alt"><span><span>if(...) </span></span></li> <li><span>{ header("...");exit();} </span></li> </ol>
还要注意的是,如果是用Unicode(UTF-8)编码时也会出现问题,需要调整PHP header的缓存设置.
<ol class="dp-xml"> <li class="alt"><span><span class="tag"><span> [</span><span class="attribute">email</span><span>=%@]%@</span><span class="attribute">LANGUAGE</span><span>=</span><span class="attribute-value">"VBSCRIPT[/email]"</span><span> </span><span class="attribute">CODEPAGE</span><span>=</span><span class="attribute-value">"936"</span><span>%</span><span class="tag">></span><span> </span></span></span></li> <li><span class="tag"><span> %if Request.ServerVariables("SERVER_NAME")="s.jb51.net" then </span></span></li> <li class="alt"><span>response.redirect "news/index.htm" </span></li> <li> <span>else%</span><span class="tag">></span><span> </span> </li> <li class="alt"><span class="tag"><span> %end if%</span><span class="tag">></span><span> </span></span></li> <li><span class="tag"><span> </span><span class="tag-name">script</span><span class="tag">></span><span> </span></span></li> <li class="alt"> <span>var </span><span class="attribute">url</span><span> = </span><span class="attribute-value">location</span><span>.href; </span> </li> <li> <span>if(url.indexOf('http://www.jb51.net/')!=-1)</span><span class="attribute">location.href</span><span>=</span><span class="attribute-value">'/index/index.htm'</span><span>; </span> </li> <li class="alt"> <span>if(url.indexOf('http://www.kanshule.com/')!=-1)</span><span class="attribute">location.href</span><span>=</span><span class="attribute-value">'/index1/index.htm'</span><span>; </span> </li> <li> <span>if(url.indexOf('http://www.shouji17.com/')!=-1)</span><span class="attribute">location.href</span><span>=</span><span class="attribute-value">'/cn/index.asp'</span><span>; </span> </li> <li class="alt"> <span>if(url.indexOf('http://www.baidu.com/')!=-1)</span><span class="attribute">location.href</span><span>=</span><span class="attribute-value">'/cn/index.asp'</span><span>; </span> </li> <li><span class="tag"><span> /script</span><span class="tag">></span><span> </span></span></li> </ol>
以上就是在使用PHP header时应当注意的几点问题。

热AI工具

Undresser.AI Undress
人工智能驱动的应用程序,用于创建逼真的裸体照片

AI Clothes Remover
用于从照片中去除衣服的在线人工智能工具。

Undress AI Tool
免费脱衣服图片

Clothoff.io
AI脱衣机

AI Hentai Generator
免费生成ai无尽的。

热门文章

热工具

记事本++7.3.1
好用且免费的代码编辑器

SublimeText3汉化版
中文版,非常好用

禅工作室 13.0.1
功能强大的PHP集成开发环境

Dreamweaver CS6
视觉化网页开发工具

SublimeText3 Mac版
神级代码编辑软件(SublimeText3)

PHP 8.4 带来了多项新功能、安全性改进和性能改进,同时弃用和删除了大量功能。 本指南介绍了如何在 Ubuntu、Debian 或其衍生版本上安装 PHP 8.4 或升级到 PHP 8.4

CakePHP 是 PHP 的开源框架。它的目的是使应用程序的开发、部署和维护变得更加容易。 CakePHP 基于类似 MVC 的架构,功能强大且易于掌握。模型、视图和控制器 gu

Visual Studio Code,也称为 VS Code,是一个免费的源代码编辑器 - 或集成开发环境 (IDE) - 可用于所有主要操作系统。 VS Code 拥有针对多种编程语言的大量扩展,可以轻松编写
