简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Home > Backend Development > PHP Tutorial > body text

Specific tips for using headers in PHP_PHP Tutorial

WBOY
Release： 2016-07-15 13:28:51
Original
809 people have browsed it

We cannot have spaces between 1, location and the ":" sign, otherwise an error will occur.

2. There cannot be any output before using the header.

3. The PHP code after using header in PHP will still be executed.

The following is a comparison with response.redirect in ASP:

Example 1:

response.redirect "../test.asp"

header("location:../test.php ");

The difference between the two:

ASP's redirect function can work after sending the header file to the client.

Such as 

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span></font></strong><span> </span></span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699"><</FONT></STRONG></SPAN><SPAN>%response.redirect "../test.asp"%</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></font></strong></span><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span></font></strong><span> </span>
</li>
</ol>
Copy after login

Check if the following code in header is used in PHP, an error will be reported: 

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span></font></strong><span> </span></span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699"><?</FONT></STRONG></SPAN><SPAN> </SPAN></SPAN><LI class=alt><SPAN></SPAN><SPAN class=tag-name><STRONG><FONT color=#006699>header</FONT></STRONG></SPAN><SPAN>("location:../test.php");  </SPAN></SPAN><LI class=""><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></font></strong></span><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span></font></strong><span> </span>
</li>
</ol>
Copy after login

It can only be like this:

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><strong><font color="#006699"><?</FONT></STRONG></SPAN><SPAN> </SPAN></SPAN><LI class=""><SPAN></SPAN><SPAN class=tag-name><STRONG><FONT color=#006699>header</FONT></STRONG></SPAN><SPAN>("location:../test.php");  </SPAN></SPAN><LI class=alt><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></font></strong></span><span> </span></span></li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span></font></strong><span>...</span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span></font></strong><span> </span>
</li>
</ol>
Copy after login

That is, no data can be sent to the client before using the header function in PHP.

Example 2:

asp

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span></font></strong><span> </span></span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699"><</FONT></STRONG></SPAN><SPAN>%  </SPAN></SPAN><LI class=alt><SPAN>response.redirect "../a.asp"  </SPAN><LI class=""><SPAN>response.redirect "../b.asp"  </SPAN><LI class=alt><SPAN>%</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></font></strong></span><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span></font></strong><span> </span>
</li>
</ol>
Copy after login

The result is to redirect the a.asp file.

What about php?

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><strong><font color="#006699"><?</FONT></STRONG></SPAN><SPAN> </SPAN></SPAN><LI class=""><SPAN></SPAN><SPAN class=tag-name><STRONG><FONT color=#006699>header</FONT></STRONG></SPAN><SPAN>("location:../a.php");  </SPAN></SPAN><LI class=alt><SPAN>header("location:../b.php");  </SPAN><LI class=""><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></font></strong></span><span> </span></span></li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span></font></strong><span> </span>
</li>
</ol>
Copy after login

We found that it redirects b.php.

It turns out that redirect is performed in asp The following code will not be executed.

After executing the header, php will continue to execute the following code.

In this regard, the header redirection in php is not as good as the redirection in asp. Sometimes we have to redirect After that, the following code cannot be executed:

Generally we use >

But we can simply use the following method:

<ol class="dp-xml">
<li class="alt"><span><span>if(...)  </span></span></li>
<li class=""><span>header("...");  </span></li>
<li class="alt"><span>else  </span></li>
<li class=""><span>{  </span></li>
<li class="alt"><span>...  </span></li>
<li class=""><span>}  </span></li>
</ol>
Copy after login

One thing to note when using headers in PHP is that problems will also occur if you use Unicode (UTF-8) encoding, and you need to adjust the cache settings.

<ol class="dp-xml">
<li class="alt"><span><span>if(...)  </span></span></li>
<li class=""><span>{ header("...");exit();}  </span></li>
</ol>
Copy after login

http://www.bkjia.com/PHPjc/446416.html

www.bkjia.com

true

http: //www.bkjia.com/PHPjc/446416.html
<ol class="dp-xml">
<li class="alt"><span><span class="tag"><strong><font color="#006699"><</FONT></STRONG></SPAN><SPAN>[</SPAN><SPAN class=attribute><FONT color=#ff0000>email</FONT></SPAN><SPAN>=%@]%@</SPAN><SPAN class=attribute><FONT color=#ff0000>LANGUAGE</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"VBSCRIPT[/email]"</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>CODEPAGE</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"936"</FONT></SPAN><SPAN>%</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></font></strong></span><span> </span></span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699"><</FONT></STRONG></SPAN><SPAN>%if Request.ServerVariables("SERVER_NAME")="s.jb51.net" then  </SPAN></SPAN><LI class=alt><SPAN>response.redirect "news/index.htm"  </SPAN><LI class=""><SPAN>else%</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></font></strong></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><strong><font color="#006699"><</FONT></STRONG></SPAN><SPAN>%end if%</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></font></strong></span><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>script</SPAN><SPAN class=tag>></span></font></strong><span> </span>
</li>
<li class="alt">
<span>var </span><span class="attribute"><font color="#ff0000">url</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">location</font></span><span>.href;  </span>
</li>
<li class="">
<span>if(url.indexOf('http://www.jb51.net/')!=-1)</span><span class="attribute"><font color="#ff0000">location.href</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">'/index/index.htm'</font></span><span>;  </span>
</li>
<li class="alt">
<span>if(url.indexOf('http://www.kanshule.com/')!=-1)</span><span class="attribute"><font color="#ff0000">location.href</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">'/index1/index.htm'</font></span><span>;  </span>
</li>
<li class="">
<span>if(url.indexOf('http://www.shouji17.com/')!=-1)</span><span class="attribute"><font color="#ff0000">location.href</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">'/cn/index.asp'</font></span><span>;  </span>
</li>
<li class="alt">
<span>if(url.indexOf('http://www.baidu.com/')!=-1)</span><span class="attribute"><font color="#ff0000">location.href</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">'/cn/index.asp'</font></span><span>;  </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>script</SPAN><SPAN class=tag>></span></font></strong><span> </span>
</li>
</ol>
Copy after login

TechArticle

We cannot have spaces between 1, location and ":", otherwise an error will occur. 2. There cannot be any output before using the header. 3. The PHP code after using header in PHP will still be executed. Below is...

Related labels：
header location php No skills specific and exist us of space
source：php.cn
Previous article：Summary of various PHP string functions_PHP tutorial Next article：Comparison of the advantages and disadvantages of PHP object-oriented and PHP process-oriented_PHP Tutorial
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
PHP arrays obtained from URL parameters do not behave as expected I have a URL parameter that contains the category ID and I want to treat it as an array li...
From 2024-04-06 22:09:02
0
1
1428
Where should I place CustomLog directive in apache I'm using php:7.2-apachedocker. I need to disable health check url login access log. Based...
From 2024-04-06 22:03:59
0
1
990
What is the format of the variables in the return value? I am a new learner of php. I found a piece of code: if($x<time()){return[false,'error']...
From 2024-04-06 21:55:20
0
1
778
Problems encountered when using opentbs to generate odt files: values ​​of the same key are displayed in the same row instead of separate columns. I'm using a library called OpenTbs to create odt using PHP, I'm using it because columns a...
From 2024-04-06 20:18:18
0
1
483
Group MySQL results by ID for looping over I have a table with flight data in mysql. I'm writing a php code that will group and displ...
From 2024-04-06 17:27:56
0
1
406
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn：Public welfare online PHP training，Help PHP learners grow quickly！