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php图形处理中的中文输出

PHP图形处理中的中文输出
gb2utf8.php 文件如下:


<?
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;
}
}
?>
[/code:1:fd411e991d]

测试文件如下:
[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请下载附件!gb2312.txt