PHP character encoding conversion class, support for ANSI, Unicode, Unicode big endian, UTF-8, Utf-8+bom Mutual conversion

PHP character encoding conversion class, support for ANSI, Unicode, Unicode big endian, UTF-8, Utf-8+bom to convert each other.

Four common text file encoding methods

ANSI Code:

No file header (file encoding at the beginning of the symbolic byte)

ANSI encoded alphanumeric account of one byte, Chinese characters accounted for two bytes

Carriage return line break, single byte, hexadecimal representation 0d 0a

Unicode encoding:

File header, hexadecimal representation of FF FE

Each character is encoded in two bytes

Carriage return newline character, double byte, hexadecimal representation of 000d 000a

Unicode Big Endian Code:

File header hexadecimal representation for FE FF

The code behind is to put the high position of the character in front, the low position in the back, exactly and the Unicode encoding upside down

Carriage return newline character, double byte, hexadecimal represented as 0d00 0a00

UTF-8 Code:

File header, hexadecimal representation for EF BB BF

UTF-8 is a variable-length character encoding for Unicode, where numbers, letters, carriage returns, and line feeds are represented by a byte, and kanji accounts for 3 bytes

Carriage return line break, single byte, hexadecimal representation 0d 0a

Conversion principle: First the character encoding to UTF-8, and then converted from UTF-8 to the corresponding character encoding.

CharsetConv.class.php

 _allow_charset) {$this->_in_charset = $in _charset; }//Check output encoding if (In_array ($out _charset, $this->_allow_charset)) {$this->_out_charset = $out _c        Harset;         "}}/** Convert * @param string $str strings to be converted * @return String converted * * * Public Function convert ($STR) {   $str = $this->convtoutf8 ($STR); First to UTF8 $str = $this->convfromutf8 ($STR);    Convert from UTF8 to corresponding code return $STR; /** encode the encoding to UTF-8 * @param string $STR * @return String */Private Function ConvToUtf8 ($STR) {if (        $this->_in_charset== ' Utf-8 ') {//code is already utf-8, no return $str;                } switch ($this->_in_charset) {case ' Utf-8bom ': $str = substr ($str, 3);            Break                Case ' ANSI ': $str = iconv (' GBK ', ' Utf-8//ignore ', $str);            Break Case ' Unicode ': $str = iconv (' Utf-16le ', ' Utf-8//ignore ', substr ($STR, 2));            Break                Case ' Unicodebe ': $str = iconv (' utf-16be ', ' Utf-8//ignore ', substr ($STR, 2));            Break        Default:break;    } return $STR;        }/** converts the UTF-8 encoding to the output encoding * @param string $STR * @return String */Private Function ConvFromUtf8 ($STR) {        if ($this->_out_charset== ' utf-8 ') {//Output code is already utf-8, do not go to return $str;                } switch ($this->_out_charset) {case ' Utf-8bom ': $str = ' \xef\xbb\xbf '. $str;            Break                Case ' ANSI ': $str = iconv (' UTF-8 ', ' Gbk//ignore ', $str);            Break                Case ' Unicode ': $str = "\xff\xfe". Iconv (' UTF-8 ', ' Utf-16le//ignore ', $str);            Break                Case ' Unicodebe ': $str = "\xfe\xff". Iconv (' UTF-8 ', ' Utf-16be//ignore ', $str);            Break        Default:break; } return $sTr }}//Class end?>

Demo:Unicode big endian to Utf-8+bom

 
  Convert ($STR); File_put_contents (' Response/utf-8bom.txt ', $response, true);? >

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The above describes the PHP character encoding conversion class, support ANSI, Unicode, Unicode big endian, UTF-8, Utf-8+bom to each other, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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