Php encode64 encoding class
Encode64 can obtain the minimum data encoded by 26 uppercase/lowercase letters and numbers plus the "-_" symbol. this string can be freely transmitted over the network, there is no need to consider the confusion caused by automatic transcoding. disadvantage: it is too slow for a large string for unknown reasons. maybe the PHP script itself is slow, so it has many built-in functions, which are intolerable if implemented using scripts. javaScript does not have this problem, and the script speed is much faster.
- // Encode64 encoding can replace encodeURI, encodeURIComponent, and endode functions at the same time, because the selected characters are not encoded.
- Class Encode64 {
- Function code ($ str ){
- $ KEY = 'paawo65gouf7ik2vi9-xq8cFTEXLCDY1Hd3tV0ryzjbpN_BlnSs4mGRkQWMZJeuh ';
- $ A = StrToBytes ($ str );
- $ Len = count ($ );
- $ 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) {// The correct number of bytes must be the remainder of 2 or 3. if there is no 1, discard it.
- $ 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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