Php automatically identifies the text encoding and converts it to the target encoding method,

Php automatically identifies the text encoding and converts it to the target encoding method,

This example describes how php automatically identifies the text encoding and converts it to the target encoding. Share it with you for your reference. The details are as follows:

When PHP processes the page, we use iconv or mb_convert functions for character set conversion. However, this is actually a prerequisite. That is, we must know in and out encoding in advance before we can perform the correct conversion.

Although most conversions are performed between gbk and UTF-8, what should I do if I do not know the encoding of the conversion object? Google's safeEncoding function can easily identify UTF-8 and GBK encoding. This function is very accurate to some extent, but it is not so useful in some complex environments. below I combined the differences between GBK and UTF-8 encoding, using regular expressions to determine the UTF-8 encoding and using the mb_convert_encoding function for conversion. in China, basically more popular encoding is GBK and UTF-8, so this function is for the two encoding for automatic conversion.

/*** @ String the text to be converted * @ encoding destination encoding **/function detect_encoding ($ string, $ encoding = 'gbk ') {$ is_utf8 = preg_match ('% ^ (? : [\ X09 \ x0A \ x0D \ x20-\ x7E] | [\ xC2-\ xDF] [\ x80-\ xBF] | \ xE0 [\ xA0-\ xBF] [\ x80-\ xBF] | [\ xE1-\ xEC \ xEE \ xEF] [\ x80-\ xBF] {2} | \ xED [\ x80-\ x9F] [\ x80 -\ xBF] | \ xF0 [\ x90-\ xBF] [\ x80-\ xBF] {2} | [\ xF1-\ xF3] [\ x80-\ xBF] {3} | \ xF4 [\ x80-\ x8F] [\ x80-\ xBF] {2 }) * $ % xs ', $ string); if ($ is_utf8 & $ encoding = 'utf8') {return $ string;} elseif ($ is_utf8) {return mb_convert_encoding ($ string, $ encoding, "UTF-8");} else {return mb_convert_encoding ($ string, $ encoding, 'gbk, gb2312, big5 ');}}

I hope this article will help you with php programming.