I have some UTF-8 content that includes multi-byte smart quote characters. I've found that this code will easily convert those characters to ASCII straight quotes (ASCII code 34):
$content = iconv("UTF-8", "ASCII//TRANSLIT", $content);
OR
$content = iconv("UTF-8", "ISO-8859-1//TRANSLIT", $content);
However, I'd rather convert these to extended ASCII smart quotes (ASCII codes 147 and 148 in Latin 1 encoding). Does anyone know how to do this?