不用iconv函数实现UTF-8编码转换GB2312的PHP函数

整理日期：2007年03月02日【字体：大中小】

伊图教程网[www.etoow.com]
http://www.etoow.com/html/2007-03/1172834839.html

　 }
　}
　else
　{
　 $ret .= substr($gbstr, 0, 1);
　 $gbstr = substr($gbstr, 1, strlen($gbstr));
　}
}
return $ret;
}
//Unicode转utf8
function u2utf8($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);
}

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不用iconv函数实现UTF-8编码转换GB2312的PHP函数
'http://www.etoow.com/html/2007-03/1172834839.html

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最新文章教程

如果使用 iconv() 函数转换编码就相比比较简单了，不过很多虚拟主机里并不支持这个组件，我在网上找半天，才找到一个gb2312转utf-8的方法，但不能逆向转换。

这个函数如下：

/*******************************
//GB转UTF-8编码
*******************************/
function gb2utf8($gbstr) {
global $CODETABLE;
if(trim($gbstr)=="") return $gbstr;
if(empty($CODETABLE)){
　$filename = dirname(__FILE__)."/gb2312-utf8.table";
　$fp = fopen($filename,"r");
　while ($l = fgets($fp,15))
　{ $CODETABLE[hexdec(substr($l, 0, 6))] = substr($l, 7, 6); }
　fclose($fp);
}
$ret = "";
$utf8 = "";
while ($gbstr) {
　if (ord(substr($gbstr, 0, 1)) > 127) {
　 $thisW = substr($gbstr, 0, 2);
　 $gbstr = substr($gbstr, 2, strlen($gbstr));
　 $utf8 = "";
　 @$utf8 = u2utf8(hexdec($CODETABLE[hexdec(bin2hex($thisW)) - 0x8080]));
　 if($utf8!=""){
　　for ($i = 0;$i < strlen($utf8);$i += 3)
　　 $ret .= chr(substr($utf8, $i, 3));