PHP Implementation ENCODE64 Encoding class example _php tutorial

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Author: User

PHP implementation ENCODE64 Encoding class instance


This article mainly introduces the implementation of PHP Encode64 encoding class, examples of PHP implementation of ENCODE64 coding skills, with a certain reference value, the need for friends can refer to the next

This paper describes the PHP implementation encode64 encoding class. Share to everyone for your reference. Specific as follows:

Encode64 can obtain the shortest 26 English-size alphanumeric plus "-_" two symbols encoded data, the string can be transmitted freely in the network, without regard to the confusion caused by automatic transcoding. Cons: For large strings too slow, the reason is unclear, maybe the php script itself is slow, so it built a lot of functions, these functions if the implementation of the script is intolerable. JavaScript does not have this problem, the script is much faster.

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ENCODE64 encoding can replace Encodeuri,encodeuricomponent,endode function at the same time

Because none of the selected characters will be encoded.

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 >>) & 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 >>) & 0x3f];

}

return $s;

}

function decode ($CODESTR) {

$KEY = ' Paawo65gouf7ik2vi9-xq8cftexlcdy1hd3tv0ryzjbpn_blnss4mgrkqwmzjeuh ';

$dic = Array ();

for ($i = 0; $i < $i + +) {

$dic [$KEY [$i]] = $i;

}

$len = strlen ($CODESTR);

$res = $len% 4;

$cLen = Floor ($len/4)

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 >>) & 0xFF;

$j + = 3;

}

if ($res = = 2) {

The correct number of bytes is definitely more than 2 or 3, No 1 case, if present, discard.

$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;

}

?>

I hope this article is helpful to everyone's PHP programming.

http://www.bkjia.com/PHPjc/973111.html www.bkjia.com true http://www.bkjia.com/PHPjc/973111.html techarticle PHP Implementation ENCODE64 Encoding Class example This article mainly introduces the implementation of PHP Encode64 coding class, example of PHP implementation of ENCODE64 coding skills, with a certain reference value, the need for friends can ...

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