php ASCII 字符变换 （汉字及特殊字符） 宽字符 （uft8/unicode）

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有点像现在流行的输入法中的特殊字符。

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1. 英文字母或者数字转ASCII 效果如上

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class:

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<?class ascii{    var $asciiText;        function ascii($text,$style)    {        switch($style)        {           case 'graffiti': include "graffiti.font"; break;           case 'banner': include 'banner.font'; break;           default: include 'dos.font'; break;        }        $text=strtolower($text);        for($c=0;$c<strlen($text);$c++) $symbol[$c]=explode("\n",$arr[$text[$c]]);        for($c=0;$c<sizeof($symbol[0]);$c++):            for($k=0;$k<strlen($text);$k++) $output.="&nbsp;".str_replace("\r","",$symbol[$k][$c]);            $output.="\n";        endfor;                $this->asciiText=$output;    }}

实例：

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<PRE><?include_once("ascii.class.php");        // includes the class's file$text=new ascii("justcoding","doc");          // first parameter is text that will be converted, second is the font styleprint $text->asciiText;                 // asciiText is variable of converted text?></PRE>

可以通过css控制字符大小。具体见附件。

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2. 汉字转ASCII 效果为 “星期天 ” 就是 “星期天”

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function encode($c){    $len = strlen($c);    $a = 0;    while ($a < $len)    {        $ud = 0;        if (ord($c{$a}) >=0 && ord($c{$a})<=127)        {            $ud = ord($c{$a});            $a += 1;        }        else if (ord($c{$a}) >=192 && ord($c{$a})<=223)        {            $ud = (ord($c{$a})-192)*64 + (ord($c{$a+1})-128);            $a += 2;        }        else if (ord($c{$a}) >=224 && ord($c{$a})<=239)        {            $ud = (ord($c{$a})-224)*4096 + (ord($c{$a+1})-128)*64 + (ord($c{$a+2})-128);            $a += 3;        }        else if (ord($c{$a}) >=240 && ord($c{$a})<=247)        {            $ud = (ord($c{$a})-240)*262144 + (ord($c{$a+1})-128)*4096 + (ord($c{$a+2})-128)*64 + (ord($c{$a+3})-128);            $a += 4;        }        else if (ord($c{$a}) >=248 && ord($c{$a})<=251)        {            $ud = (ord($c{$a})-248)*16777216 + (ord($c{$a+1})-128)*262144 + (ord($c{$a+2})-128)*4096 + (ord($c{$a+3})-128)*64 + (ord($c{$a+4})-128);            $a += 5;        }        else if (ord($c{$a}) >=252 && ord($c{$a})<=253)        {            $ud = (ord($c{$a})-252)*1073741824 + (ord($c{$a+1})-128)*16777216 + (ord($c{$a+2})-128)*262144 + (ord($c{$a+3})-128)*4096 + (ord($c{$a+4})-128)*64 + (ord($c{$a+5})-128);            $a += 6;        }        else if (ord($c{$a}) >=254 && ord($c{$a})<=255)        { //error            $ud = false;        }        $scill .= "&#$ud;";    }    return $scill;}echo encode('日'); // &#26085; 浏览器默认会解读，所以要看源代码

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3. utf-8 unicode 互转

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<?// 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;   }}echo utf8_unicode('以');?>

<?// unicode - utf8function 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;  }echo u2utf8('20197');?>

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