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【PHP】 encod64加密函数
作者:昕楠 / 发布于2014/11/18/ 598

	<?PHP
	//encode64编码可以同时取代encodeURI,encodeURIComponent,endode函数, 因为选取的这些字符都不会被编码.
	class Encode64{
	 function code($str) {
	 $KEY = 'PaAwO65goUf7IK2vi9-xq8cFTEXLCDY1Hd3tV0ryzjbpN_BlnSs4mGRkQWMZJeuh';
	 $a = StrToBytes($str);
	 $len = count($a);
	 $res = $len % 3;
	 $s = "";$i = 2;$v = 0;
	 for (; $i < $len; $i += 3) {
	 $v = $a[$i - 2] + ($a[$i - 1] << 8) + ($a[$i] << 16);
	 $s .= $KEY[$v & 0x3f];
	 $s .= $KEY[($v >> 6) & 0x3f];
	 $s .= $KEY[($v >> 12) & 0x3f];
	 $s .= $KEY[($v >> 18)];
	 }
	 if ($res == 1) {
	 $v = $a[$i - 2];
	 $s .= $KEY[$v & 0x3f];
	 $s .= $KEY[($v >> 6) & 0x3f];
	 } else if ($res == 2) {
	 $v = $a[$i - 2] + ($a[$i - 1] << 8);
	 $s .= $KEY[$v & 0x3f];
	 $s .= $KEY[($v >> 6) & 0x3f];
	 $s .= $KEY[($v >> 12) & 0x3f];
	 }
	 return $s;
	 }
	 function decode($codeStr) {
	 $KEY = 'PaAwO65goUf7IK2vi9-xq8cFTEXLCDY1Hd3tV0ryzjbpN_BlnSs4mGRkQWMZJeuh';
	 $dic = array();
	 for ($i = 0; $i < 64; $i++) {
	 $dic[$KEY[$i]] = $i;
	 }
	 $len = strlen($codeStr);
	 $res = $len % 4;
	 $cLen = floor($len/4)*3;
	 if($res==2) $clen += 1;
	 elseif($res==3) $clen += 2;
	 $code = range(0,$clen);
	 $i = 3;$v = 0; $j = 0;
	 for (; $i < $len; $i += 4) {
	 $v = $dic[$codeStr[$i - 3]];
	 $v += $dic[$codeStr[$i - 2]] << 6;
	 $v += $dic[$codeStr[$i - 1]] << 12;
	 $v += $dic[$codeStr[$i]] << 18;
	 $code[$j] = $v & 0xff;
	 $code[$j+1] = ($v >> 8) & 0xff;
	 $code[$j+2] = ($v >> 16) & 0xff;
	 $j += 3;
	 }
	 if ($res == 2) {//正确的字节数肯定是余2或3, 没有1的情况, 如果出现, 舍弃.
	 $v = $dic[$codeStr[$i - 3]];
	 $v += $dic[$codeStr[$i - 2]] << 6;
	 $code[$j] = $v & 0xff;
	 } else if ($res == 3) {
	 $v = $dic[$codeStr[$i - 3]];
	 $v += $dic[$codeStr[$i - 2]] << 6;
	 $v += $dic[$codeStr[$i - 1]] << 12;
	 $code[$j] = $v & 0xff;
	 $code[$j+1] = ($v >> 8) & 0xff;
	 }
	 return BytesToStr($code);
	 }
	}
	function BytesToStr($bytes) {
	 $str = '';
	 foreach($bytes as $ch) {
	 $str .= chr($ch);
	 }
	 return iconv('UTF-16BE','utf-8',$str);
	}
	function StrToBytes($str) {
	 $str = iconv('utf-8','UTF-16BE',$str);
	 $len = strlen($str);
	 $bytes = array();
	 for($i=0;$i<$len;$i++) {
	 $bytes[] = ord($str[$i]) ;
	 }
	 return $bytes;
	}
	?>
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　encod64　　加密　
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