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一段将GB编码转换为utf8的代码
 
 
修改时间:[2010/05/17 03:28]    阅读次数:[1186]    发表者:[起缘]
 
一段将GB编码转换为utf8的代码

gb2utf8.php 文件如下:


Class GB2UTF8
{
var
$gb;          
// 待转换的utf-8字符串
var $utf8;        
// 转换后的UTF8字符串
    
var $CodeTable;   
// 转换过程中使用的utf-8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->Setutf-8
();
(
$this->gb=="")?0:$this->Convert
();
}

function
Setutf-8($InStr="utf-8.txt"
)
{                  
// 设置utf-8代码文件,默认为utf-8.txt
$this->ErrorMsg=""
;
$tmpfile($InStr
);
        if (!
$tmp
) {
            
$this->ErrorMsg="No utf-8"
;
            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utf-8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
;
}
}




测试文件如下:

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);



说明:
需要正确设置font文件,请先确认可以使用font直接(不使用gb2utf8)输出英文。
utf-8.txt请在网上查找
 
 
 
 
 
 

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