A brief discussion on PHP character encoding conversion method

print_r(iconv_get_encoding("all"));

2 to convert the encoding of the string:

echo iconv('utf-8','gb2312','we'); //Convert 'us' from utf8 encoding to gb2312 encoding
**iconv(in_charset,outcharset//TRANSLIT// IGNORE,$string);//'TRANSLIT': If the output encoding format does not contain a character, you can find and replace it in a similar encoding; 'IGNORE': If the output format encoding does not contain a character in the string , can skip encoding of subsequent characters. Otherwise, the output will be interrupted when transcoding fails and an error will occur.

3 to convert the string encoding (the encoding type can be automatically determined, but I heard that the efficiency is not as good as iconv.)

mb_convert_encoding('us', 'utf-8', 'gb2312' ); // Convert 'us' from gb2312 to utf8
mb_convert_encoding('us', 'utf-8'); // Convert 'us' to utf8 encoding format
$str = mb_convert_encoding($str, "EUC-JP", "auto");
$str = mb_convert_encoding($str, "UCS-2LE", "JIS, eucjp-win , sjis-win");
**The third parameter can also be in the form of array()

When it comes to the usage of the mb_convert_encoding encoding conversion function, you can read:

• php encoding conversion function mb_convert_encoding and iconv
• Instructions for using php encoding conversion function mb_convert_encoding and iconv

４. Set encoding format:

iconv_set_encoding("internal_encoding", "UTF-8"); //Set the internal encoding to utf8
iconv_set_encoding("output_encoding", "ISO-8859-1"); //Set the output encoding to ISO- 8859-1
Setting options: 1.input_encoding 2.output_encoding ３.internal_encoding
**ISO-8859-1 encoding is a single-byte encoding, backward compatible with ASCII, Latin1 is an alias of ISO-8859-1

５, check the string encoding method: Format: string mb_detect_encoding(string$str[,mixed$encoding_list= mb_detect_order()[,bool$strict= false]] )

$str='encoding';
echo mb_detect_encoding($str); //: UTF-8
echo mb_detect_encoding($str, "auto");
echo mb_detect_encoding($str, "JIS, eucjp-win, sjis-win");
$ary[] = "ASCII";
$ary[] = "JIS";
$ary[] = "EUC-JP";
echo mb_detect_encoding($str, $ ary);

６ and check the file encoding method:

$file = 'text3.txt';
echo getFileEncoding(file_get_contents($file)); // Output UTF-16LE

7 to determine whether the string conforms to the specified format encoding : Format: bool mb_check_encoding([string$var=NULL[,string$encoding= mb_internal_encoding()]] )

$string="x00x81";
$encoding="Shift_JIS";
mb_check_encoding($string,$encoding)　 //:true

８, single or multiple variables Character encoding conversion: Format: stringmb_convert_variables(string$to_encoding,mixed$from_encoding,mixed&$vars[,mixed&$...] ) **$from_encoding: can be in numeric form, comma separated string or structure form.

$str1= 'Test encoding';$str21= 'Test encoding 2';
$inputenc = mb_convert_variables("UTF-8", "UTF-8,GBK,GB2312", $str1, $str2 );
var_dump($inputenc); //: string(5) "UTF-8"
var_dump($str1); //: string(12) "Test encoding"
**CP936 is GBK