PHP Implementation ENCODE64 Encoding class example _php tutorial

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; } ?>

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