How to convert gbk to utf8 in php?

The iconv() function can be used in php to convert gbk encoding to utf8 encoding; the iconv function can convert a known character set file into another known character set file, the syntax format is " iconv('GBK', 'UTF-8', string)".

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#Convert gbk to utf8 in php

In php, you can use the iconv() function to convert gbk to utf8.

The iconv function can convert a known character set file into another known character set file. For example: Convert from GB2312 to UTF-8.

iconv function is built in php5, and the GB character set is turned on by default.

Example:

<?php
header("Content-type:text/html;charset=GB2312");
echo $str= &#39;你好,这里是gbk转utf8!&#39;;
echo &#39;<br />&#39;;
echo iconv(&#39;GB2312&#39;, &#39;UTF-8&#39;, $str); //将字符串的编码从GB2312转到UTF-8

Description: php iconv function

The iconv function library in php can complete the conversion between various character sets, which is php A basic function library that is indispensable in programming; but sometimes iconv is less able to transcode some data for no reason. For example, an error will occur when converting the character "—" to gb2312.

Let’s take a look at the usage of this function.

The simplest application, replace gb2312 with utf-8:

$text=iconv("GB2312","UTF-8",$text);

is using $text=iconv("UTF-8","GB2312 ",$text) During the process, if some special characters are encountered, such as "—", "." in English names, etc., the conversion will be interrupted. The text after these characters cannot be converted further.

To solve this problem, you can use the following code to achieve it:

$text=iconv("UTF-8","GBK",$text);

You read that right, it’s that simple, just write GBK instead of using gb2312.

There is another method, the second parameter, add //IGNORE, ignore the error, as follows:

iconv("UTF-8","GB2312//IGNORE",$data);

There is no specific comparison between these two methods, I feel that the second parameter One (GBK instead of gb2312) approach is better.

Description of iconv() in the PHP manual:

iconv

(PHP 4 > = 4.0.5, PHP 5)
iconv – Convert string to requested character encoding
Description
string iconv ( string in_charset, string out_charset, string str )
Performs a character set conversion on the string str from in_charset to out_charset. Returns the converted string or FALSE on failure.
If you append the string //TRANSLIT to out_charset transliteration is activated. This means that when a character can't be represented in the target charset, it can be approximated through one or several similarly looking characters. If you append the string //IGNORE, characters that cannot be represented in the target charset are silently discarded. Otherwise, str is cut from the first illegal character.

When using this function to convert string encoding, please note that if you convert utf-8 to gb2312, the string may be truncated. At this time, you can use the following method to solve the problem:

$str=iconv('utf-8',"gb2312//TRANSLIT",file_get_contents($filepath));

That is, add the red part in the second parameter, which means: if no characters matching the source encoding are found in the target encoding, similar characters will be selected. Make the conversion. You can also use the //IGNORE parameter here to ignore characters that cannot be converted.

ignore means to ignore errors during conversion. Without the ignore parameter, all strings following this character cannot be saved.

iconv is not the default function of php, and it is also a module installed by default. It needs to be installed before it can be used.

If it is windows2000 php, you can modify the php.ini file and remove the ";" before extension=php_iconv.dll. At the same time, you need to copy the iconv.dll under your original php installation file to your Under winnt/system32 (if your dll points to this directory). In the Linux environment, using static installation, just add an additional item --with-iconv when configure. The iconv item can be seen in phpinfo. (Linux7.3 Apache4.06 php4.3.2).

Introduction to mb_convert_encoding and iconv functions

mb_convert_encodingThis function is used to convert encoding. I used to not understand the concept of program coding, but now I seem to understand a little bit. However, English generally does not have encoding problems, only Chinese data will have this problem. For example, when you use Zend Studio or Editplus to write a program, you use gbk encoding. If the data needs to be entered into the database, and the database encoding is utf8, then the data must be encoded and converted, otherwise it will become garbled when entering the database. .

Make a GBK To UTF-8:

<?php 
header("content-Type: text/html; charset=Utf-8"); 
echo mb_convert_encoding("妳係我的友仔", "UTF-8", "GBK"); 
?>

Then make a GB2312 To Big5:

<?php 
header("content-Type: text/html; charset=big5"); 
echo mb_convert_encoding("你是我的朋友", "big5", "GB2312"); 
?>

But use the above The function needs to be installed but the mbstring extension library needs to be enabled first.

string mb_convert_encoding ( string str, string to_encoding [, mixed from_encoding] )You need to enable the mbstring extension library first, and remove the mb_convert_encoding in front of; extension=php_mbstring.dll in php.ini You can specify multiple input encodings, and it will automatically identify them based on the content, but the execution efficiency is much worse than iconv;

string iconv ( string in_charset, string out_charset, string str )注意：第二个参数，除了可以指定要转化到的编码以外，还可以增加两个后缀：//TRANSLIT 和 //IGNORE，其中 //TRANSLIT 会自动将不能直接转化的字符变成一个或多个近似的字符，//IGNORE 会忽略掉不能转化的字符，而默认效果是从第一个非法字符截断。

一般情况下用 iconv，只有当遇到无法确定原编码是何种编码，或者iconv转化后无法正常显示时才用mb_convert_encoding 函数。

$content = iconv("GBK", "UTF-8″, $content);
$content = mb_convert_encoding($content, "UTF-8″, "

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