PHP's GB2312-UTF-8 conversion function_PHP tutorial

The following is a function of gb2312 -> UTF-8. I copied the algorithm of
unicode -> UTF-8, so it is actually not much more than GB2312->unicode
. Please pay attention to calling gb2utf8 () cannot mix Chinese and English
GB2312.txt file required by the program
//Program writen by sadly www.phpx.com
//gb2utf8.php
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; $i$ret.=chr(substr($utf8,$i,3));
return $ret;
}
function u2utf8($c)
{
for($i=0;$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;
}
?>
Call example: output "China" through GD Two Chinese characters
example.php
//Header("Content-type: image/gif");
$im = imagecreate(400,300);
$bkg = ImageColorAllocate ($im, 0,0,0);
$clr = ImageColorAllocate($im, 255,255,255);
$fnt = "d:/winnt/fonts/simhei.ttf";
include(" gb2utf8.php");
$str = gb2utf8("China");
ImageTTFText($im, 20, 0, 10, 20, $clr, $fnt, $str);
ImageGif( $im);
ImageDestroy($im);
?>
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http://www.bkjia.com/PHPjc/445195.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445195.htmlTechArticleThe following is a gb2312-UTF-8 function. I copied the unicode-UTF-8 algorithm, so the actual There is not much more than GB2312-unicode. Please note that when calling gb2utf8(), you cannot mix Chinese and English...