PHP character encoding conversion class, supports ANSI, Unicode, Unicode big endian, UTF-8, UTF-8+Bom mutual conversion

php character encoding conversion class, supports ANSI, Unicode, Unicode big endian, UTF-8, UTF-8+Bom and other conversions.

Four common text file encoding methods

ANSI encoding:

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

ANSI encoding alphanumeric occupies one byte, Chinese characters occupy two bytes

carriage return and line feed, single byte, hexadecimal representation is 0d 0a

UNICODE encoding:

file header, hexadecimal representation is FF FE

Each character is encoded with two bytes

carriage return and line feed character, double bytes, hexadecimal representation is 000d 000a

Unicode big endian encoding:

The hexadecimal representation of the file header is FE FF

The following encoding puts the high bit of the character in the front and the low bit in the back, which is exactly the opposite of the Unicode encoding

The carriage return and line feed character, Double byte, hexadecimal representation is 0d00 0a00

UTF-8 encoding:

File header, hexadecimal representation is EF BB BF

UTF-8 is Unicode A variable-length character encoding. Numbers, letters, carriage returns, and line feeds are all represented by one byte. Chinese characters occupy 3 bytes

carriage return and line feed, single byte, hexadecimal representation is 0d 0a

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

CharsetConv.class.php

<?php
/** 字符编码转换类, ANSI、Unicode、Unicode big endian、UTF-8、UTF-8+Bom互相转换
*   Date:   2015-01-28
*   Author: fdipzone
*   Ver:    1.0
*
*   Func:
*   public  convert       转换
*   private convToUtf8    把编码转为UTF-8编码
*   private convFromUtf8  把UTF-8编码转换为输出编码
*/

class CharsetConv{ // class start

    private $_in_charset = null;   // 源编码
    private $_out_charset = null;  // 输出编码
    private $_allow_charset = array(&#39;utf-8&#39;, &#39;utf-8bom&#39;, &#39;ansi&#39;, &#39;unicode&#39;, &#39;unicodebe&#39;);


    /** 初始化
    * @param String $in_charset  源编码
    * @param String $out_charset 输出编码
    */
    public function __construct($in_charset, $out_charset){

        $in_charset = strtolower($in_charset);
        $out_charset = strtolower($out_charset);

        // 检查源编码
        if(in_array($in_charset, $this->_allow_charset)){
            $this->_in_charset = $in_charset;
        }

        // 检查输出编码
        if(in_array($out_charset, $this->_allow_charset)){
            $this->_out_charset = $out_charset;
        }

    }


    /** 转换
    * @param  String $str 要转换的字符串
    * @return String      转换后的字符串
    */
    public function convert($str){

        $str = $this->convToUtf8($str);   // 先转为utf8
        $str = $this->convFromUtf8($str); // 从utf8转为对应的编码

        return $str;
    }


    /** 把编码转为UTF-8编码
    * @param  String $str 
    * @return String
    */
    private function convToUtf8($str){

        if($this->_in_charset=='utf-8'){ // 编码已经是utf-8，不用转
            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;

    }


    /** 把UTF-8编码转换为输出编码
    * @param  String $str
    * @return String
    */
    private function convFromUtf8($str){

        if($this->_out_charset=='utf-8'){ // 输出编码已经是utf-8，不用转
            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 converted to utf-8+bom

<?php
require "CharsetConv.class.php";

$str = file_get_contents(&#39;source/unicodebe.txt&#39;);

$obj = new CharsetConv(&#39;unicodebe&#39;, &#39;utf-8bom&#39;);
$response = $obj->convert($str);

file_put_contents('response/utf-8bom.txt', $response, true);
?>

Source code download address: Click to view

The above introduces the PHP character encoding conversion class, which supports ANSI, Unicode, Unicode big endian, UTF-8, UTF-8+Bom and other conversions, including relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.