Encoding functions from UTF to WIN-1251 and back

<? php
function utf2win1251 ($ content)
{
$ newcontent = "";

for ($ i = 0; $ i <strlen ($ content); $ i ++)
{
$ c1 = substr ($ content, $ i, 1);
$ byte1 = ord ($ c1);
if ($ byte1 >> 5 == 6)
{
$ i ++;
$ c2 = substr ($ content, $ i, 1);
$ byte2 = ord ($ c2);
$ byte1 & = 31;
$ byte2 & = 63;
$ byte2 | = (($ byte1 & 3) << 6);
$ byte1 >> = 2;
$ word = ($ byte1 << 8) + $ byte2;

if ($ word == 1025) $ newcontent. = chr (168);
else if ($ word == 1105) $ newcontent. = chr (184);
else if ($ word> = 0x0410 && $ word <= 0x044F) $ newcontent. = chr ($ word-848);
else
{
$ a = dechex ($ byte1);
$ a = str_pad ($ a, 2, “0”, STR_PAD_LEFT);
$ b = dechex ($ byte2);
$ b = str_pad ($ b, 2, “0”, STR_PAD_LEFT);
$ newcontent. = "& # x". $ a. $ b. ";";
}
}
else
$ newcontent. = $ c1;
}
')
return $ newcontent;
}

function win12512utf ($ content)
{
$ content = preg_replace ("#% u ([0-9A-F] {1,4}) # ie", "'& #'. hexdec ('\\ 1'). ';" ", $ content) ;
$ content = html_entity_decode (urldecode ($ content), ENT_NOQUOTES, "windows-1251");

return $ content;
}
?>