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 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 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 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 , 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', $content);
5、在PHP程序中,可以加上一行,来指定PHP源程序的编码:
header('Content-type: text/html; charset=gbk');
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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