Detailed explanation on PHP automatically determining the character set and transcoding_PHP tutorial

The principle is very simple, because gb2312/gbk is Chinese two bytes, these two bytes have a value range, while Chinese characters in UTF-8 are three bytes, and each byte also has a value range. Regardless of the encoding situation, English is less than 128 and only occupies one byte (except full-width).
If it is an encoding check in the form of a file, you can also directly check the BOM information of utf-8. Without further ado, let’s go directly to the function. This function is used to check and transcode strings.

Copy code The code is as follows:

function safeEncoding($string,$outEncoding ='UTF -8')
{
$encoding = "UTF-8";
for($i=0;$i {
if (ord($string{$i})<128)
continue;

if((ord($string{$i})&224)==224)
{
//The first byte is passed
$char = $string{++$i};
if((ord($char)&128)==128)
$char = $string{++$i}; // The second byte is passed $char = $string{++$i};
if((ord($char)&128)==128)
$encoding = " UTF-8";
                                                92) 
 {
                                                                                                                                                       >                                                                                                                                                     🎜> if(strtoupper($encoding) == strtoupper($outEncoding))
return $string;
else
return iconv($encoding,$outEncoding,$string);
}
?>






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The principle is very simple, because gb2312/gbk is Chinese two bytes, and these two bytes have a value range , and Chinese characters in UTF-8 are three bytes, and each byte also has a value range. And English no matter...