PHP uses iconv to convert a string from GBK to UTF8 character set

PHP uses iconv to convert a string from GBK to the UTF8 character set. For more information, see. 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:

The 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:

The code is as follows:

Echo $ str = 'Hi, it's coffee sale! ';
Echo'
';
Echo iconv ('gb2312', 'utf-8', $ str); // Encode the string from GB2312 to UTF-8
Echo'
';
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:

The code is as follows:

$ Str = 'I love Baidu ';
$ Utf = '';
For ($ I = 0; $ I Echo $ utf;
?>

If your php file is GB, the following code can work:

The code is as follows:

$ Str = 'I love Baidu ';
$ Str = iconv ("GBK", "UTF-8", $ str );
$ Utf = '';
For ($ I = 0; $ I Echo $ utf;
?>

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