GB2312->UTF-8的转换函数

这个函数是干嘛的？哦，把汉字转换成UTF-8后，就可以在GD中使用了！

<?

//Program writen by sadly www.phpx.com

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));

$utf8.=u2utf8(hexdec($codetable[hexdec(bin2hex($this))-0x8080]));

}

else

{

$gb=substr($gb,1,strlen($gb));

$utf8.=u2utf8(substr($gb,0,1));

}

}

$ret=\"\";

for($i=0;$i<strlen($utf8);$i+=3)

$ret.=chr(substr($utf8,$i,3));

return $ret;

}

function u2utf8($c)

{

for($i=0;$i<count($c);$i++)

$str=\"\";

if ($c < 0x80) {

$str.=$c;

}

else if ($c < 0x800) {

$str.=(0xC0 | $c>>6);

$str.=(0x80 | $c & 0x3F);

}

else if ($c < 0x10000) {

$str.=(0xE0 | $c>>12);

$str.=(0x80 | $c>>6 & 0x3F);

$str.=(0x80 | $c & 0x3F);

}

else if ($c < 0x200000) {

$str.=(0xF0 | $c>>18);

$str.=(0x80 | $c>>12 & 0x3F);

$str.=(0x80 | $c>>6 & 0x3F);

$str.=(0x80 | $c & 0x3F);

}

return $str;

}

Header(\"Content-type: image/gif\");

$im = imagecreate(400,300);

$bkg = ImageColorAllocate($im, 0,0,0);

$clr = ImageColorAllocate($im, 255,255,255);

$fnt = \"wb.ttf\";

//include(\"gb2utf8.php\");

$str = gb2utf8(\"中国\");

ImageTTFText($im, 20, 0, 10, 20, $clr, $fnt, $str);

ImageGif($im);

ImageDestroy($im);

?>
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