Summary of related solutions to php header garbled problem

Solution to garbled php header: 1. Add the statement "header("Content-type: text/html; charset=utf-8");" to the PHP page; 2. Use the META tag to set the page Encoding; 3. Unify the encoding of PHP pages.

php header solves garbled code problems and other garbled code problems

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php header to define a php page as utf encoding or GBK encoding

php page as utf encoding

header("Content-type: text/html; charset=utf-8");

php page as gbk encoding

header("Content-type: text/html; charset=gb2312");

php page is big5 encoded

header("Content-type: text/html; charset=big5");

Usually the above code is placed on the homepage of the php page

The difference between using header or meta to implement PHP page encoding

1. Page encoding

1. Use the 1dd9d9bc813bb1594796bd2b8615c022 tag to set the page encoding

This The function of the tag is to declare what character set encoding the client's browser uses to display the page. xxx can be GB2312, GBK, UTF-8 (different from MySQL, which is UTF8), etc. Therefore, most pages can use this method to tell the browser what encoding to use when displaying this page, so as to avoid encoding errors and garbled characters. But sometimes we will find that this sentence still doesn't work. No matter which xxx is, the browser always uses the same encoding. I will talk about this situation later.

Please note that e8e496c15ba93d81f6ea4fe5f55a2244 belongs to HTML information and is just a statement. It works to indicate that the server has passed the HTML information to the browser.

2. header("content-type:text/html; charset=xxx");

The function of this function header() is to send the information in the brackets to the http header.

If the content in the brackets is as mentioned in the article, the function is basically the same as the 3f2ae36b77c0b1762e465ca019e7bd30 tag. If you compare it with the first one, you will find that the characters are similar. But the difference is that if there is this function, the browser will always use the xxx encoding you requested and will never be disobedient, so this function is very useful. Why is this so? Then we have to talk about the difference between HTTPS headers and HTML information:

The https header is a string sent by the server before transmitting HTML information to the browser using the HTTP protocol.

Because the meta tag belongs to html information, the content sent by header() reaches the browser first. The popular point is that header() has a higher priority than meta (I don’t know if this can be said). Add a php page that has both header("content-type:text/html; charset=xxx") and 1dd9d9bc813bb1594796bd2b8615c022 , the browser will only recognize the former http header and not the meta. Of course, this function can only be used within PHP pages.

There is also a question left, why does the former definitely work, but the latter sometimes doesn’t? This is why we want to talk about Apache next.

3. AddDefaultCharset

In the conf folder in the root directory of Apache, there is the entire Apache configuration document httpd.conf.

Open httpd.conf with a text editor. Line 708 (different versions may be different) contains AddDefaultCharset xxx, where xxx is the encoding name. The meaning of this line of code: Set the character set in the https header of the web page file in the entire server to your default xxx character set. Having this line is equivalent to adding a header ("content-type: text/html; charset=xxx") to each file. Now you can understand why the browser always uses gb2312 even though the meta setting is utf-8.

If there is a header("content-type:text/html; charset=xxx") in the web page, the default character set will be changed to the character set you set, so this function will always be useful. If you add a "#" in front of AddDefaultCharset xxx, comment out this sentence, and the page does not contain header ("content-type..."), then it is the meta tag's turn to take effect.

Summary:

Let’s sort

header("content-type:text/html; charset=xxx") 
AddDefaultCharset xxx 
<META http-equiv="content-type" content="text/html; charset=xxx">

If you are a web programmer, add a header("content-type: text/html ; charset=xxx"), ensuring that it can be displayed correctly on any server and has strong portability.

As for the sentence AddDefaultCharset xxx, whether it should be commented or not is a matter of opinion. Anyway, I commented it out, but I also need to write header() when writing a page, so that it can be displayed normally on the server.

2. Database encoding

Before querying the database, the PHP program first executes mysql_query("SET NAMES xxxx"); where xxxx is the encoding of your web page (charset= xxxx), if charset=utf8 in the web page, then xxxx=utf8, if charset=gb2312 in the web page, then xxxx=gb2312, almost all WEB programs have a common code to connect to the database, which is placed in a file. In this file Here, just add mysql_query("set names").

SET NAMES 显示客户端发送的 SQL 语句中使用什么字符集。因此，SET NAMES 'utf-8'语句告诉服务器“将来从这个客户端传来的信息采用字符集utf-8”。它还为服务器发送回客户端的结果指定了字符集。（例如，如果你使用一 个SELECT语句，它表示列值使用了什么字符集。） 

PHP页面编码统一 

MySQL数据库编码、html页面编码、PHP或html文件本身编码要全部一致。 

　　1、MySQL数据库编码：建立数据库时指定编码（如gbk_chinese_ci)，建立数据表、建立字段、插入数据时不要指定编码，会自动继承数据库的编码。 

数据库连接时，也有编码，可以在连接完数据库后，执行 

mysql_query('SET NAMES gbk');//将gbk换成你的编码，如utf8。

　　2、html页面的编码，指的是这一行的设置： 

<meta http-equiv="Content-Type" content="text/html; charset=gbk" />

　　3、PHP或html文件本身的编码：用editplus打开php文件或html文件，另存时，选择的编码，如果数据库和页面编码是gbk,则这儿的编码选择ansi；如果数据库和页面编码是utf-8，则这儿也选择utf-8。 

　　4、另外要注意的是，Javascript或Flash中传递的数据是utf-8编码，如果数据库和页面编码是gbk，要进行转码，然后写入数据库。 

iconv('utf-8', 'gbk', $content);

5、在PHP程序中，可以加上一行，来指定PHP源程序的编码： 

header('Content-type: text/html; charset=gbk');

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