Summary of iconv function knowledge in PHP, summary of phpiconv function_PHP tutorial

Summary of knowledge about the iconv function in PHP, summary of the phpiconv function

Today, when I was revising my paper online, I encountered the iconv function. Learn

header('Content-Type: application/vnd.ms-excel;charset=UTF-8"');
$name=iconv('utf-8', 'gb2312', $data['year'].'年，第'.$data['period'].'期通信录');
header('Content-Disposition: attachment;filename="' . $name . '.xls"');
header('Cache-Control: max-age=0');

The meaning of this code is to convert the utf-8 format into gb2312 format, and then assign it to $name. In this way, when the name of the excel file is exported, it will be the Chinese name of $name.
The following is the detailed and extended usage of this function

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.

The iconv() function is built-in in php5. Thank you.

Example:

 <&#63;php
 echo $str= '你好,这里是卖咖啡!';
 echo '<br />';
 echo iconv('GB2312', 'UTF-8', $str);   //将字符串的编码从GB2312转到UTF-8
 echo '<br />';
 
 echo iconv_substr($str, 1, 1, 'UTF-8');  //按字符个数截取而非字节     
 print_r(iconv_get_encoding());      //得到当前页面编码信息

 echo iconv_strlen($str, 'UTF-8');     //得到设定编码的字符串长度

//也有这样用的

 $content = iconv("UTF-8","gbk//TRANSLIT",$content); 

&#63;>

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 Windows 2000 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 in your original PHP installation file to your winnt/system32 Next (if your dll points to this directory)

In the Linux environment, use static installation and add an additional item --with-iconv when configure. The iconv item can be seen in phpinfo. (Linux7.3 Apache4.06 php4.3.2),

Download: ftp://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.8.tar.gz
Installation:

#cp libiconv-1.8.tar.gz /usr/local/src
#tar zxvf lib*
#./configure --prefix=/usr/local/libiconv
#make
#make install

Compile php

#./configure --prefix=/usr/local/php4.3.2 --with-iconv=/usr/local/libiconv/

Simple example of usage:

<&#63;php 
 echo iconv("gb2312","ISO-8859-1","我们"); 
&#63;>

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. .

For the usage of mb_convert_encoding, please see the official website:
http://cn.php.net/manual/zh/function.mb-convert-encoding.php

Make a GBK To UTF-8

< &#63;php 
 header("content-Type: text/html; charset=Utf-8"); 
 echo mb_convert_encoding("妳係我的友仔", "UTF-8", "GBK"); 
&#63;> 

Another GB2312 To Big5

< &#63;php 
 header("content-Type: text/html; charset=big5"); 
 echo mb_convert_encoding("你是我的朋友", "big5", "GB2312"); 
&#63;> 

However, to use the above function, you need to install and enable the mbstring extension library first.

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

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, and remove the ; in front of extension=php_mbstring.dll in php.ini
mb_convert_encoding can specify multiple input encodings. It will automatically identify based on the content, but the execution efficiency is much worse than iconv;

string iconv (string in_charset, string out_charset, string str)
Note: In addition to specifying the encoding to be converted to, the second parameter can also add two suffixes: //TRANSLIT and //IGNORE, where //TRANSLIT will automatically convert characters that cannot be directly converted into one or more Approximate characters, //IGNORE will ignore characters that cannot be converted, and the default effect is to truncate from the first illegal character.
Returns the converted string or FALSE on failure.

Use:

It was found that iconv would make an error when converting the character "-" to gb2312. Without the ignore parameter, all strings following this character 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.

In general, 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.

from_encoding is specified by character code name before conversion. it can be array or string - comma separated enumerated list. If it is not specified, the internal encoding will be used.
/* Auto detect encoding from JIS, eucjp-win, sjis-win, then convert str to UCS-2LE */
$str = mb_convert_encoding($str, “UCS-2LE”, “JIS, eucjp-win, sjis-win”);
/* “auto” is expanded to “ASCII,JIS,UTF-8,EUC-JP,SJIS” */
$str = mb_convert_encoding($str, “EUC-JP”, “auto”);

Example:

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

Parameters that are easily overlooked when using the iconv function in php

When processing the captured content today, when using iconv for encoding conversion, I found that the result would be interrupted. I guessed it was a problem with the character set. I considered how to skip characters that did not exist in the target character set. I checked the manual and found that iconv The function only has three parameters, but it doesn't seem to work. Then I checked the Internet and someone said it could, but I was very surprised how to implement it. Finally, I found that the English description said that you can add a label to the end of the target code: "TRANSLIT". I was very depressed. How to add it? It turns out that "//" was added first. It's really depressing. There is such a design
Prototype: $txtContent = iconv("utf-8",'GBK',$txtContent);

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

Two optional auxiliary parameters: TRANSLIT and IGNORE (where IGNORE means to skip if it encounters something that cannot be converted).

The above is the entire content of this article, I hope you all like it.

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