一段将GB编码转换为utf8的代码



Class GB2UTF8 

{ 

var $gb;          // 待转换的GB2312字符串 

var $utf8;        // 转换后的UTF8字符串 

    var $CodeTable;   // 转换过程中使用的GB2312代码文件数组 

    var $ErrorMsg;    // 转换过程之中的错误讯息 



function GB2UTF8($InStr="") 

{ 

$this->gb=$InStr; 

$this->SetGb2312(); 

($this->gb=="")?0:$this->Convert(); 

} 



function SetGb2312($InStr="gb2312.txt") 

{                  // 设置gb2312代码文件，默认为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() 

{                   // 转换GB2312字符串到UTF8字符串，需预先设置$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; 

} 

}



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中国456def测试正确"; 

$obj->Convert(); 

ImageTTFText($im, 20, 0, 5, 50, $white, "SIMKAI.TTF", $obj->utf8); 

ImagePNG($im); 

ImageDestroy($im);