用php实现gb2312和unicode间的编码转换_PHP教程

$text = "脚本之家"; 
preg_match_all("/[\x80-\xff]?./",$text,$ar); 
foreach($ar[0] as $v) 
echo "&#".utf8_unicode(iconv("GB2312","UTF-8",$v)).";"; 
?> 
// utf8 -> unicode 
function utf8_unicode($c) { 
switch(strlen($c)) { 
case 1: 
return ord($c); 
case 2: 
$n = (ord($c[0]) & 0x3f) << 6; 
$n += ord($c[1]) & 0x3f; 
return $n; 
case 3: 
$n = (ord($c[0]) & 0x1f) << 12; 
$n += (ord($c[1]) & 0x3f) << 6; 
$n += ord($c[2]) & 0x3f; 
return $n; 
case 4: 
$n = (ord($c[0]) & 0x0f) << 18; 
$n += (ord($c[1]) & 0x3f) << 12; 
$n += (ord($c[2]) & 0x3f) << 6; 
$n += ord($c[3]) & 0x3f; 
return $n; 
} 
} 
?> 
 
下面的例子是利用php将"全"这中编码转换为gb2312. 
 代码如下:

$str = "TTL全天候自动聚焦"; 
$str = preg_replace("|&#([0-9]{1,5});|", "\".u2utf82gb(\\1).\"", $str); 
$str = "\$str=\"$str\";"; 
eval($str); 
echo $str; 
function u2utf82gb($c){ 
$str=""; 
if ($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 iconv('UTF-8', 'GB2312', $str); 
} 
?> 
 
或者是 
 代码如下:

function unescape($str) { 
$str = rawurldecode($str); 
preg_match_all("/(?:%u.{4})|&#x.{4};|&#\d+;|.+/U",$str,$r); 
$ar = $r[0]; 
print_r($ar); 
foreach($ar as $k=>$v) { 
if(substr($v,0,2) == "%u") 
$ar[$k] = iconv("UCS-2","GB2312",pack("H4",substr($v,-4))); 
elseif(substr($v,0,3) == "&#x") 
$ar[$k] = iconv("UCS-2","GB2312",pack("H4",substr($v,3,-1))); 
elseif(substr($v,0,2) == "&#") { 
echo substr($v,2,-1)."
"; 
$ar[$k] = iconv("UCS-2","GB2312",pack("n",substr($v,2,-1))); 
} 
} 
return join("",$ar); 
} 
$str = "TTL全天候自动聚焦"; 
echo unescape($str); //out TTL全天候自动聚焦 
 
利用javascript来转换 
 代码如下:

 
 
 
 
 
下面是一个显示所有全角半角的字体的查看例子 
 代码如下:

 
 
 
 
 
 
 
 
 

自定义： -  
 

 
 
 
下面是一个查表(gb2312),转换gb2312到utf8的例子, 现在有iconv函数,这个已经没有太大的意义了, 
 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); 
} 
} 
return $utf8; 
} 
function u2utf8($c){ 
$str=""; 
if ($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; 
} 
?> 


http://www.bkjia.com/PHPjc/313788.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/313788.htmlTechArticlegb2312 和 unicode 间的编码转换 下面的例子是将 gb2312 转换为 ""这种形式 php4.3.1以后的iconv函数很好用的，只是需要自己写一个uft8到unicode的转...