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php将GB编码转换为utf8
发布时间:2017-07-02 14:06:30

 

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$this->utf8.=chr(substr($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$str=\"\";
if ($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。
gb2312.txt请在网上查找

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