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 -> unicodefunction 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'&#20840;'这中编码转换为gb2312.<?php$str = 'TTL&#20840;&#22825;&#20505;&#33258;&#21160;&#32858;&#28966;';$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);}

$str = 'TTL&#20840;&#22825;&#20505;&#33258;&#21160;&#32858;&#28966;';echo unescape($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 <seasonx@163.net>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 onclick='modi_str()' value=' 确 定 '> <input type=reset value=' 清 空 '> <input type=button onclick='document.all.text.method.checked?document.all.text.encode.select():document.all.text.decode.select()' 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;}

?>