php实现的一个UTF8编码转Unicode的函数
-
-
function utf8tounicode(strutf8) - {
- var bstr = “”;
- var ntotalchars = strutf8.length; // total chars to be processed.
- var noffset = 0; // processing point on strutf8
- var nremainingbytes = ntotalchars; // how many bytes left to be converted
- var noutputposition = 0;
- var icode, icode1, icode2; // the value of the unicode.
while (nOffset { - iCode = strUtf8.charCodeAt(nOffset);
- if ((iCode & 0×80) == 0) // 1 byte.
- {
- if ( nRemainingBytes break;
bstr += String.fromCharCode(iCode & 0×7F); - nOffset ++;
- nRemainingBytes -= 1;
- }
- else if ((iCode & 0xE0) == 0xC0) // 2 bytes
- {
- iCode1 = strUtf8.charCodeAt(nOffset + 1);
- if ( nRemainingBytes (iCode1 & 0xC0) != 0×80 ) // invalid pattern
- {
- break;
- }
bstr += String.fromCharCode(((iCode & 0×3F) nOffset += 2; - nRemainingBytes -= 2;
- }
- else if ((iCode & 0xF0) == 0xE0) // 3 bytes
- {
- iCode1 = strUtf8.charCodeAt(nOffset + 1);
- iCode2 = strUtf8.charCodeAt(nOffset + 2);
- if ( nRemainingBytes (iCode1 & 0xC0) != 0×80 || // invalid pattern
- (iCode2 & 0xC0) != 0×80 )
- {
- break;
- }
bstr += String.fromCharCode(((iCode & 0×0F) ((iCode1 & 0×3F) (iCode2 & 0×3F)); - nOffset += 3;
- nRemainingBytes -= 3;
- }
- else // 4 or more bytes — unsupported
- break;
- }
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if (nRemainingBytes != 0) - {
- // bad UTF8 string.
- return “”;
- }
return bstr; - }
- ?>
-
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