Php implementation of the encode64 encoding class _ PHP Tutorial-php Tutorial

Php implements the encode64 encoding class instance. This article describes how to implement the encode64 encoding class in php. The example shows how to implement the encode64 encoding class in php, which has some reference value, if you need a friend, you can use php to implement the encode64 encoding class instance.

This article mainly introduces the php encode64 encoding class. The example analyzes php's skills for implementing encode64 encoding, which has some reference value. if you need it, you can refer

This example describes how to implement the encode64 encoding class in php. Share it with you for your reference. The details are as follows:

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.

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// 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 2 or 3. if no value is 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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This article describes how to implement the encode64 encoding class in php. The example shows how to implement the encode64 encoding in php. it has some reference value...