What to do if php iconv is Chinese garbled

php iconv Chinese garbled solution: first download the libiconv function library and install libiconv; then recompile php; finally add the parameter "//IGNORE" after the encoding that needs to be converted.

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How to use the iconv function in php to solve Chinese garbled characters

The iconv function library can complete conversion between various character sets and is an indispensable basic function library in PHP programming.

1. Download the libiconv function library libiconv-1.x.tar.gz;

2. Unzip tar -zxvf libiconv-1.x.tar.gz;

3. Install libiconv

＃configure --prefix=/usr/local/iconv 
#make 
#make install

4. Recompile php and add compilation parameters --with-iconv=/usr/local/iconv

under windows

The iconv function converts the captured utf-8 encoded page into gb2312. Only by using the iconv function to transcode the captured data, the data will be less for no reason.

This is a bug in the iconv function. iconv will make an error when converting the character "—" to gb2312. The solution is very simple, that is, add "//IGNORE" after the encoding that needs to be converted, which is the second parameter of the iconv function. As follows:

The following is the quoted content:

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

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, use static installation and add an additional item --with-iconv when configure That's it, phpinfo can see the items of iconv.

Simple example of use:

$zip = new ZipArchive();//打开文件 如果文件已经存在则覆盖，如果没有则创建  
if($zip->open($destination,$overwrite?ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE)!==true){
  return false;
 }
//向压缩文件add the files  
foreach($valid_files as $file){
     //$zip->addFile($file,$file);
     $file_info_arr= pathinfo($file);
     $filename =$file_info_arr['basename'];
     $filesss = iconv('UTF-8', 'GBK//IGNORE', $filename);
     $zip->addFile($file,$filesss);
}

Introduction to mb_convert_encoding and iconv functions in PHP

mb_convert_encoding This 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. .

See the official usage of mb_convert_encoding:

http://cn.php.net/manual/zh/function.mb-convert-encoding.php

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

Another function iconv in PHP is also used to convert string encoding, and has similar functions to the above function.

There are some detailed examples below:

iconv — Convert string to requested character encoding

(PHP 4 >= 4.0.5, PHP 5)

mb_convert_encoding — Convert character encoding

(PHP 4 >= 4.0.6, PHP 5)

Usage:

string mb_convert_encoding ( string str, string to_encoding [ , mixed from_encoding] )

You need to enable the mbstring extension library first. In php.ini, remove the ; in front of extension=php_mbstring.dll

mb_convert_encoding can specify multiple input encodings, and it will Automatically identify based on content, but the execution efficiency is much worse than iconv;

string iconv (string in_charset, string out_charset, string str)

Note: The second parameter can be used to specify the conversion In addition to the encoding, you can also add two suffixes: //TRANSLIT and //IGNORE. //TRANSLIT will automatically convert characters that cannot be converted directly into one or more approximate characters. //IGNORE will ignore characters that cannot be converted. characters, and the default effect is to truncate from the first illegal character.

Returns the converted string or FALSE on failure.

Usage: It is found that iconv will make an error when converting the character "-" to gb2312. If there is no ignore parameter, all strings following this character will be Cannot be saved. No matter what, this "—" cannot be converted successfully and cannot be output. In addition, mb_convert_encoding does not have this bug.

Generally use iconv. Only use the mb_convert_encoding function when you are unable to determine what the original encoding is, or when iconv cannot be displayed normally after conversion.

Small pitfalls in using mb_convert_encoding transcoding in PHP:

Everyone is familiar with using the mb_convert_encoding() method to convert character encodings in PHP programs, and it is also used in large quantities. And in general, this method performs well enough and deserves praise. But in a project we needed to use it to convert UTF8 to GBK, and found a minor problem when converting some special characters. The specific manifestation is that mb converts characters that can be encoded in utf8 but cannot be encoded in gbk into \0x00\0x80, which causes problems with the converted gbk characters.

In our minds, during the character encoding conversion process, if we encounter characters that cannot be represented by the target encoding, what the transcoding program should do is discard such characters. In this way, although some data is lost, it will not The character sequence that caused transcoding is unavailable. It's not clear why mb should use the above method instead of discarding it.

The temporary solution is to filter the transcoded string sequence and filter out all \x00\80 characters; or filter the utf8 string before escaping and filter out ut8. Represents all characters that cannot be represented by gbk. In terms of implementation difficulty, the first filtering method is relatively easy to implement.

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