PHP ASCII码转换操作类
PHP ASCII码转换类可以把中文转ascii码。并且可以批量转换，还增加了一个常用的ascii代码还原字符。
具体代码如下：
<?php<br />class ascii<br />{<br /> <br />function decode($str)<br />{<br /> preg_match_all( "/(d{2,5})/", $str,$a);<br /> $a = $a[0];<br /> foreach ($a as $dec)<br /> {<br /> if ($dec < 128)<br /> {<br /> $utf .= chr($dec);<br /> }<br /> else if ($dec < 2048)<br /> {<br /> $utf .= chr(192 + (($dec - ($dec % 64)) / 64));<br /> $utf .= chr(128 + ($dec % 64));<br /> }<br /> else<br /> {<br /> $utf .= chr(224 + (($dec - ($dec % 4096)) / 4096)); <br /> $utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64)); <br /> $utf .= chr(128 + ($dec % 64)); <br /> } <br /> } <br /> return $utf; <br />}<br /> <br />function encode($c)<br />{ <br /> $len = strlen($c); <br /> $a = 0; <br /> while ($a < $len)<br /> {<br /> $ud = 0; <br /> if (ord($c{$a}) >=0 && ord($c{$a})<=127)<br /> {<br /> $ud = ord($c{$a}); <br /> $a += 1; <br /> }<br /> else if (ord($c{$a}) >=192 && ord($c{$a})<=223)<br /> {<br /> $ud = (ord($c{$a})-192)*64 + (ord($c{$a+1})-128); <br /> $a += 2; <br /> }<br /> else if (ord($c{$a}) >=224 && ord($c{$a})<=239)<br /> {<br /> $ud = (ord($c{$a})-224)*4096 + (ord($c{$a+1})-128)*64 + (ord($c{$a+2})-128); <br /> $a += 3; <br /> }<br /> else if (ord($c{$a}) >=240 && ord($c{$a})<=247)<br /> {<br /> $ud = (ord($c{$a})-240)*262144 + (ord($c{$a+1})-128)*4096 + (ord($c{$a+2})-128)*64 + (ord($c{$a+3})-128); <br /> $a += 4; <br /> }<br /> else if (ord($c{$a}) >=248 && ord($c{$a})<=251)<br /> {<br /> $ud = (ord($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);<br /> $a += 5; <br /> }<br /> else if (ord($c{$a}) >=252 && ord($c{$a})<=253)<br /> {<br /> $ud = (ord($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); <br /> $a += 6; <br /> }<br /> else if (ord($c{$a}) >=254 && ord($c{$a})<=255)<br /> { //error<br /> $ud = false; <br /> } <br /> $scill .= "&#$ud;";<br /> } <br /> return $scill; <br />}<br /> <br />}<br />?>
