PHP uses iconv to convert a string from GBK to UTF8 Character Set

1. iconv () Introduction
The iconv function can convert a known character set file to another known character set file. Example: Convert from GB2312 to UTF-8.
The iconv function is built in php5. The GB character set is enabled by default.
2. iconv () Error
Iconv will encounter an error when converting the characters "-" To gb2312. The solution is to add "// IGNORE" after the encoding to be converted, that is, after the second parameter of the iconv function:
Copy codeThe Code is as follows:
Iconv ("UTF-8", "GB2312 // IGNORE", $ data)

Ignore indicates that the conversion error is ignored. Without the ignore parameter, all strings after this character cannot be saved.
3. iconv () Example
Example 1:
Copy codeThe Code is as follows:
<? Php
Echo $ str = 'Hi, it's coffee sale! ';
Echo '<br/> ';
Echo iconv ('gb2312', 'utf-8', $ str); // encode the string from GB2312 to UTF-8
Echo '<br/> ';
Echo iconv_substr ($ str, 1, 1, 'utf-8'); // truncate by number of characters rather than bytes
Print_r (iconv_get_encoding (); // obtain the encoding information of the current page.
Echo iconv_strlen ($ str, 'utf-8'); // you can specify the length of the encoded string.
?>

Example 2:
If your php file is UTF-8 encoded, the following code can be output correctly:
Copy codeThe Code is as follows:
<? Php
$ Str = 'I love Baidu ';
$ Utf = '';
For ($ I = 0; $ I <strlen ($ str); $ I ++) $ utf. = sprintf ("% 02X", ord (substr ($ str, $ I, 1 )));
Echo $ utf;
?>

If your php file is GB, the following code can work:
Copy codeThe Code is as follows:
<? Php
$ Str = 'I love Baidu ';
$ Str = iconv ("GBK", "UTF-8", $ str );
$ Utf = '';
For ($ I = 0; $ I <strlen ($ str); $ I ++) $ utf. = sprintf ("% 02X", ord (substr ($ str, $ I, 1 )));
Echo $ utf;
?>

In the above cases, the program outputs the following content:
% E6 % 88% 91% E7 % 88% B1 % E7 % 99% BE % E5 % BA % A6