ronen at greyzone dot com
02-Mar-2002 09:37
The following function will take a utf-8 encoded string and convert it to
Unicode entities (the format is &#nnn; or &#nnnnn; with n={0..9} ).
Most browsers will display Unicode entities regardless of the encoding of
the page. Otherwise try charset=utf-8 to make sure the entities display
correctly. This works well with IE and Mozilla (tested with Mozilla 0.9.8
for X-Windos).
/**
* takes a string of utf-8 encoded characters
and converts it to a string of unicode entities
* each unicode entitiy
has the form &#nnnnn; n={0..9} and can be displayed by utf-8
supporting
* browsers
* @param $source string encoded using utf-8
[STRING]
* @return string of unicode entities [STRING]
* @access
public
*/
function utf8ToUnicodeEntities ($source) {
// array
used to figure what number to decrement from character order value
//
according to number of characters used to map unicode to ascii by
utf-8
$decrement[4] = 240;
$decrement[3] = 224;
$decrement[2] =
192;
$decrement[1] = 0;
// the number of bits to shift each
charNum by
$shift[1][0] = 0;
$shift[2][0] = 6;
$shift[2][1] =
0;
$shift[3][0] = 12;
$shift[3][1] = 6;
$shift[3][2] =
0;
$shift[4][0] = 18;
$shift[4][1] = 12;
$shift[4][2] =
6;
$shift[4][3] = 0;
$pos = 0;
$len = strlen
($source);
$encodedString = '';
while ($pos < $len)
{
$asciiPos = ord (substr ($source, $pos, 1));
if (($asciiPos
>= 240) && ($asciiPos <= 255)) {
// 4 chars
representing one unicode character
$thisLetter = substr ($source,
$pos, 4);
$pos += 4;
}
else if (($asciiPos >= 224)
&& ($asciiPos <= 239)) {
// 3 chars representing one
unicode character
$thisLetter = substr ($source, $pos, 3);
$pos
+= 3;
}
else if (($asciiPos >= 192) && ($asciiPos
<= 223)) {
// 2 chars representing one unicode
character
$thisLetter = substr ($source, $pos, 2);
$pos +=
2;
}
else {
// 1 char (lower ascii)
$thisLetter =
substr ($source, $pos, 1);
$pos += 1;
}
// process the
string representing the letter to a unicode entity
$thisLen = strlen
($thisLetter);
$thisPos = 0;
$decimalCode = 0;
while
($thisPos < $thisLen) {
$thisCharOrd = ord (substr ($thisLetter,
$thisPos, 1));
if ($thisPo
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