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977天前<?php |
class ascii |
{ |
function decode($str) |
{ |
preg_match_all( "/(d{2,5})/", $str,$a); |
$a = $a[0]; |
foreach ($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 $utf; |
} |
function encode($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; |
} |
} |
/* |
PHP 转 ASCII |
require_once "ascii_class.php"; |
*/ |
$aa = new ascii; |
echo $aa -> encode("a"); |
?> |
