php ASCII 字符转换 （汉字及特殊字符） 宽字符 （uft8/unicode）

kidys

　　有点像现在流行的输入法中的特殊字符。
　　

　　1. 英文字母或者数字转ASCII 效果如上


　　class:

<?
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：

<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 style
print $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。
　　2. 汉字转ASCII 效果为 “&#26143;&#26399;&#22825; ” 就是 “星期天”



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

　　3. utf-8 unicode 互转



<?
// 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;
}
}
echo utf8_unicode('以');
?>

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