[代码]php代码：
?php
class ascii {
/**
* 将ascii码转为字符串
* @param type $str 要解码的字符串
* @param type $prefix 前缀，默认:#
* @return type
*/
function decode($str, $prefix=#) {
$str = str_replace($prefix, , $str);
$a = explode(, $str);
foreach ($a as $dec) {
if ($dec 128) {
$utf .= chr($dec);
} else if ($dec 2048) {
$utf .= chr(192 + (($dec - ($dec % 64)) / 64));
$utf .= chr(128 + ($dec % 64));
} else {
$utf .= chr(224 + (($dec - ($dec % 4096)) / 4096));
$utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
$utf .= chr(128 + ($dec % 64));
}
}
return $utf;
}
/**
* 将字符串转换为ascii码
* @param type $c 要编码的字符串
* @param type $prefix 前缀，默认：#
* @return string
*/
function encode($c, $prefix=#) {
$len = strlen($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) {
56 $ud = (ord($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 .= $prefix.$ud.
}
return $scill;
}
}
/*
PHP 转 ASCII
require_once ascii_class.php
*/
$aa = new ascii;
echo xmp
echo $str = $aa-encode(PHP二次开发：www.php2.cc
echo /xmp
echo $aa-decode($str);
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