Class GB2UTF8 v2.0.1

 
http://www.chinaunix.net 作者:HonestQiao  發表於：2003-08-01 18:27:21

gb2utf8.php 文件如下：

     [code:1:fd411e991d]
<?
Class GB2UTF8
{
var $gb;          // 待轉換的GB2312字符串
var $utf8;        // 轉換後的UTF8字符串
    var $CodeTable;   // 轉換過程中使用的GB2312代碼文件數組
    var $ErrorMsg;    // 轉換過程之中的錯誤訊息

function GB2UTF8($InStr="")
{
$this->gb=$InStr;
$this->SetGb2312();
($this->gb=="")?0:$this->Convert();
}

function SetGb2312($InStr="gb2312.txt")
{                  // 設置gb2312代碼文件，默認爲gb2312.txt
$this->ErrorMsg="";
$tmp=@file($InStr);
        if (!$tmp) {
            $this->ErrorMsg="No GB2312";
            return false;
            }
$this->CodeTable=array();
while(list($key,$value)=each($tmp)) {
$this->CodeTable[hexdec(substr($value,0,6))]=substr($value,7,6);
}
}
 
function Convert()
{                   // 轉換GB2312字符串到UTF8字符串，需預先設置$gb
$this->utf8="";
if(!trim($this->gb) || $this->ErrorMsg!="") {
return ($this->utf8=$this->ErrorMsg);
}
        $str=$this->gb;

while($str) {
if (ord(substr($str,0,1))>127)
{
$tmp=substr($str,0,2);
$str=substr($str,2,strlen($str));
$tmp=$this->U2UTF8(hexdec($this->CodeTable[hexdec(bin2hex($tmp))-0x8080]));
for($i=0;$i<strlen ($tmp);$i+=3)
$this->utf8.=chr(substr($tmp,$i,3));
}
else
{
$tmp=substr($str,0,1);
$str=substr($str,1,strlen($str));
$this->utf8.=$tmp;
}
}
return $this->utf8;
}

function U2UTF8($InStr)
{
for($i=0;$i<count($InStr);$i++)
$str="";
if ($InStr < 0x80) {
$str.=ord($InStr);
}
else if ($InStr < 0x800) {
$str.=(0xC0 | $InStr>>6);
$str.=(0x80 | $InStr & 0x3F);
}
else if ($InStr < 0x10000) {
$str.=(0xE0 | $InStr>>12);
$str.=(0x80 | $InStr>>6 & 0x3F);
$str.=(0x80 | $InStr & 0x3F);
}
else if ($InStr < 0x200000) {
$str.=(0xF0 | $InStr>>18);
$str.=(0x80 | $InStr>>12 & 0x3F);
$str.=(0x80 | $InStr>>6 & 0x3F);
$str.=(0x80 | $InStr & 0x3F);
}
return $str;
}
}
?>
[/code:1:fd411e991d]

測試文件如下：
[code:1:fd411e991d]
<?php
Header("Content-type: image/png");
$im = imagecreate(400,300);
$black = ImageColorAllocate($im, 0,0,0);
$white = ImageColorAllocate($im, 184,44,6);
include("gb2utf8.php");
$obj=new gb2utf8();
$obj->gb="123abc中國456def測試正確";
$obj->Convert();
ImageTTFText($im, 20, 0, 5, 50, $white, "SIMKAI.TTF", $obj->utf8);
ImagePNG($im);
ImageDestroy($im);
?>
[/code:1:fd411e991d]

說明：
需要正確設置font文件，請先確認可以使用font直接（不使用gb2utf8）輸出英文。
gb2312.txt請在網上查找