图象函数中的中文显示

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在www.phpx.com上读到一段代码,是把GB码转换到UTF8,php中TTF支持UTF8编码的非ASCII字符输出.在分析这段代码之后,发现可以实现中文与ASCII混合输出图象,这样在我们操作图象函数时可以更方便.
代码如下:
<?

function gb2utf8($gb)
{
if(!trim($gb))
return $gb;
$filename="gb2312.txt";
$tmp=file($filename);
$codetable=array();
while(list($key,$value)=each($tmp))
$codetable[hexdec(substr($value,0,6))]=substr($value,7,6);

$utf8="";
while($gb)
{
if (ord(substr($gb,0,1))>127)
{
$this=substr($gb,0,2);
$gb=substr($gb,2,strlen($gb)-2);
$utf8.=u2utf8(hexdec($codetable[hexdec(bin2hex($this))-0x8080]));
}
else
{
$this=substr($gb,0,1);
$gb=substr($gb,1,strlen($gb)-1);
$utf8.=u2utf8($this);
}
}

/*$ret="";
for($i=0;$i<strlen($utf8);$i+=3)
$ret.=chr(substr($utf8,$i,3));

return $ret;*/

return $utf8;
}
function u2utf8($c)
{
/*for($i=0;$i<count($c);$i++)*/
$str="";
if ($c < 0x80) {
$str.=$c;
}
else if ($c < 0x800) {
$str.=chr(0xC0 | $c>>6);
$str.=chr(0x80 | $c & 0x3F);
}
else if ($c < 0x10000) {
$str.=chr(0xE0 | $c>>12);
$str.=chr(0x80 | $c>>6 & 0x3F);
$str.=chr(0x80 | $c & 0x3F);
}
else if ($c < 0x200000) {
$str.=chr(0xF0 | $c>>18);
$str.=chr(0x80 | $c>>12 & 0x3F);
$str.=chr(0x80 | $c>>6 & 0x3F);
$str.=chr(0x80 | $c & 0x3F);
}
return $str;
}
?>

--------------------------------------------
<?
Header ("Content-type: image/jpeg");
$im = imagecreate (800, 400);
$black = ImageColorAllocate ($im, 0, 0, 0);
$white = ImageColorAllocate ($im, 255, 255, 255);
include("gb2utf8.php");
$str=gb2utf8("aaa中过32434");
ImageTTFText ($im, 90, 10, 110, 300, $white, "/usr/share/fonts/default/TrueType/simsun.ttc",
$str);

ImageJPEG ($im);
ImageDestroy ($im);

?>

GB2312.txt文件请到www.phpx.com上找.