本篇教你用php实现gb2312和unicode间的编码转换：
gb2312 和 unicode 间的编码转换
下面的例子是将 gb2312 转换为 "全"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的转换函数 查表(gb2312.txt)也行 <? $text = "电子书库"; preg_match_all("/[\x80-\xff]?./",$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. <?php $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', $str); } ?>
或者是
function unescape($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)."<br>"; $ar[$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
<style> BODY { FONT-SIZE: 9pt; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; } input { FONT-SIZE: 9pt; height: 13pt; } </style>
<script language="JavaScript1.2"> /* This following code are designed and writen by Windy_sk <[email protected]> You can use it freely, but u must held all the copyright items! */
function Str2Unicode(str){ var arr = new Array(); for(var i=0;i<str.length;i++){ arr[i]="&#" + str.charCodeAt(i) + ";"; } return(arr.toString().replace(/,/g,"")); }
function Unicode2oStr(str){ var re=/&#[\da-fA-F]{1,5};/ig; var arr=str.match(re); if(arr==null)return(""); for(var i=0;i<arr.length;i++){ arr[i]=String.fromCharCode(arr[i].replace(/[&#;]/g,"")); } return(arr.toString().replace(/,/g,"")) }
function modi_str(){ if(document.all.text.method.checked){ if(document.all.text.decode.value!=""){ document.all.text.encode.value = Str2Unicode(document.all.text.decode.value); }else{ document.all.text.decode.value = Unicode2oStr(document.all.text.encode.value); } }else{ if(document.all.text.encode.value!=""){ document.all.text.decode.value = Unicode2oStr(document.all.text.encode.value); }else{ document.all.text.encode.value = Str2Unicode(document.all.text.decode.value); } } } </script> <title>Unicode</title> <form name=text> 文本原型：<br> <textarea name="decode" cols="100" rows="10"></textarea> <br> 转换代码：<br> <textarea name="encode" cols="100" rows="10"></textarea> <br> <input type="checkbox" name="method" checked> 正向转换 <input type=button value=" 确 定 "> <input type=reset value=" 清 空 "> <input type=button value=" 全 选 "> </form>
下面是一个显示所有全角半角的字体的查看例子
<style> BODY { FONT-SIZE: 9pt; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; } input { FONT-SIZE: 9pt; height: 13pt; } </style> <script> function showUni(min,max){ show.document.open(); show.document.writeln("<style>body{font-size:9pt;word-break:break-all;}</style>"); show.document.writeln(min + " - " + max + "<br><br>"); var i=0; for(i=min;i<=max;i++){ show.document.write("&#" + i + ";"); } show.document.close(); } </script> <input type=button value="半角" onclick=showUni(32,126)> <input type=button value="全角" onclick=showUni(65281,65374)> <input type=button value="中文1" onclick=showUni(19968,40869)> <input type=button value="中文2" onclick=showUni(63744,64045)> <input type=button value="日文平" onclick=showUni(12353,12435)> <input type=button value="日文片" onclick=showUni(12449,12534)> <input type=button value="韩文" onclick=showUni(44032,55203)> <br>自定义：<input name=min> - <input name=max> <input type=button value="察看" onclick=showUni(parseInt(document.all.min.value),parseInt(document.all.max.value))> <br> <iframe src="about:blank" id=show width=100% height=70% scroll=no></iframe>
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,
<? 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; }
?>