//PHP base64_encode

<?phpfunction str_encode($str){ return base64_encode(iconv('GB18030','UTF-8',$str));}echo str_encode('你好!美女!');?>

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另附PHP的base64的加解密函數！

{echo base64_encode($str).'<br />';;//加密$ss='Z25pZD0yNSZncGljaT0x'; echo base64_decode($ss); //解密/////////////////////////////////////////////////////////////////////////////////////

//JavaScript; base64_decode

<script language='javascript'>/* utf.js - UTF-8 <=> UTF-16 convertion** Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>* Version: 1.0* LastModified: Dec 25 1999* This library is free.; You can redistribute it and/or modify it.*/

/** Interfaces:* utf8 = utf16to8(utf16);* utf16 = utf16to8(utf8);*/

function utf16to8(str) { var out, i, len, c;

out = ''; len = str.length; for(i = 0; i < len; i++) { c = str.charCodeAt(i); if ((c >= 0x0001) && (c <= 0x007F)) { out += str.charAt(i); } else if (c > 0x07FF) { out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F)); out += String.fromCharCode(0x80 | ((c >>6) & 0x3F)); out += String.fromCharCode(0x80 | ((c >>0) & 0x3F)); } else { out += String.fromCharCode(0xC0 | ((c >>6) & 0x1F)); out += String.fromCharCode(0x80 | ((c >>0) & 0x3F)); } } return out;}

function utf8to16(str) { var out, i, len, c; var char2, char3;

out = ''; len = str.length; i = 0; while(i < len) { c = str.charCodeAt(i++); switch(c >> 4) { case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: // 0xxxxxxx out += str.charAt(i-1); break; case 12: case 13: // 110x xxxx10xx xxxx char2 = str.charCodeAt(i++); out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F)); break; case 14: // 1110 xxxx; 10xx xxxx; 10xx xxxx char2 = str.charCodeAt(i++); char3 = str.charCodeAt(i++); out += String.fromCharCode(((c & 0x0F) << 12) | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0)); break; } }

return out;}

/* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>* Version: 1.0* LastModified: Dec 25 1999* This library is free.; You can redistribute it and/or modify it.*/

/** Interfaces:* b64 = base64encode(data);* data = base64decode(b64);*/

var base64EncodeChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';var base64DecodeChars = new Array( -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1,; 0,; 1,; 2,; 3,; 4,; 5,; 6,; 7,; 8,; 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);

function base64encode(str) { var out, i, len; var c1, c2, c3;

len = str.length; i = 0; out = ''; while(i < len) { c1 = str.charCodeAt(i++) & 0xff; if(i == len) { out += base64EncodeChars.charAt(c1 >> 2); out += base64EncodeChars.charAt((c1 & 0x3) << 4); out += '=='; break; } c2 = str.charCodeAt(i++); if(i == len) { out += base64EncodeChars.charAt(c1 >> 2); out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)); out += base64EncodeChars.charAt((c2 & 0xF) << 2); out += '='; break; } c3 = str.charCodeAt(i++); out += base64EncodeChars.charAt(c1 >> 2); out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)); out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)); out += base64EncodeChars.charAt(c3 & 0x3F); } return out;}

function base64decode(str) { var c1, c2, c3, c4; var i, len, out;

len = str.length; i = 0; out = ''; while(i < len) { /* c1 */ do { c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff]; } while(i < len && c1 == -1); if(c1 == -1) break;

/* c2 */ do { c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]; } while(i < len && c2 == -1); if(c2 == -1) break;

out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

/* c3 */ do { c3 = str.charCodeAt(i++) & 0xff; if(c3 == 61) return out; c3 = base64DecodeChars[c3]; } while(i < len && c3 == -1); if(c3 == -1) break;

out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

/* c4 */ do { c4 = str.charCodeAt(i++) & 0xff; if(c4 == 61) return out; c4 = base64DecodeChars[c4]; } while(i < len && c4 == -1); if(c4 == -1) break; out += String.fromCharCode(((c3 & 0x03) << 6) | c4); } return out;}//input base64 encodefunction strdecode(str){ return utf8to16(base64decode(str));}document.write(strdecode('5L2g5aW9Iee+juWlsyE='));</script>