可以使用以下代码行，其中需要UTF-8输入。
$chr_map = array(
// Windows codepage 1252
"\xC2\x82" => "'", // U+0082⇒U+201A single low-9 quotation mark
"\xC2\x84" => '"', // U+0084⇒U+201E double low-9 quotation mark
"\xC2\x8B" => "'", // U+008B⇒U+2039 single left-pointing angle quotation mark
"\xC2\x91" => "'", // U+0091⇒U+2018 left single quotation mark
"\xC2\x92" => "'", // U+0092⇒U+2019 right single quotation mark
"\xC2\x93" => '"', // U+0093⇒U+201C left double quotation mark
"\xC2\x94" => '"', // U+0094⇒U+201D right double quotation mark
"\xC2\x9B" => "'", // U+009B⇒U+203A single right-pointing angle quotation mark
// Regular Unicode // U+0022 quotation mark (")
// U+0027 apostrophe (')
"\xC2\xAB" => '"', // U+00AB left-pointing double angle quotation mark
"\xC2\xBB" => '"', // U+00BB right-pointing double angle quotation mark
"\xE2\x80\x98" => "'", // U+2018 left single quotation mark
"\xE2\x80\x99" => "'", // U+2019 right single quotation mark
"\xE2\x80\x9A" => "'", // U+201A single low-9 quotation mark
"\xE2\x80\x9B" => "'", // U+201B single high-reversed-9 quotation mark
"\xE2\x80\x9C" => '"', // U+201C left double quotation mark
"\xE2\x80\x9D" => '"', // U+201D right double quotation mark
"\xE2\x80\x9E" => '"', // U+201E double low-9 quotation mark
"\xE2\x80\x9F" => '"', // U+201F double high-reversed-9 quotation mark
"\xE2\x80\xB9" => "'", // U+2039 single left-pointing angle quotation mark
"\xE2\x80\xBA" => "'", // U+203A single right-pointing angle quotation mark
);
$char_val = array_keys ($chr_map); // but: for efficiency you should
$rpl = array_values($chr_map); // pre-calculate these two arrays
$str = str_replace($char_val, $rpl, html_entity_decode($str, ENT_QUOTES, "UTF-8"));每个unicode字符都完全属于一个“常规类别”。
其中，可以包含引号的是-
Ps "Punctuation, Open" Pe "Punctuation, Close" Pi "Punctuation, Initial quote (might behave like Ps or Pe depending on its usage)" Pf "Punctuation, Final quote (might behave like Ps or Pe depending on its usage)" Po "Punctuation, Other"
如果用户不确定输入是UTF-8编码的，则可以在执行其他操作之前放置以下代码-
if ( !preg_match('/^\\X*$/u', $str)) {
$str = utf8_encode($str);
}如果数据需要在0x80-0x9F范围内进行标准化，则可以使用以下代码-
$normalization_map = array( "\xC2\x80" => "\xE2\x82\xAC", // U+20AC Euro sign "\xC2\x82" => "\xE2\x80\x9A", // U+201A single low-9 quotation mark "\xC2\x83" => "\xC6\x92", // U+0192 latin small letter f with hook "\xC2\x84" => "\xE2\x80\x9E", // U+201E double low-9 quotation mark "\xC2\x85" => "\xE2\x80\xA6", // U+2026 horizontal ellipsis "\xC2\x86" => "\xE2\x80\xA0", // U+2020 dagger "\xC2\x87" => "\xE2\x80\xA1", // U+2021 double dagger "\xC2\x88" => "\xCB\x86", // U+02C6 modifier letter circumflex accent "\xC2\x89" => "\xE2\x80\xB0", // U+2030 per mille sign "\xC2\x8A" => "\xC5\xA0", // U+0160 latin capital letter s with caron "\xC2\x8B" => "\xE2\x80\xB9", // U+2039 single left-pointing angle quotation mark "\xC2\x8C" => "\xC5\x92", // U+0152 latin capital ligature oe "\xC2\x8E" => "\xC5\xBD", // U+017D latin capital letter z with caron "\xC2\x91" => "\xE2\x80\x98", // U+2018 left single quotation mark "\xC2\x92" => "\xE2\x80\x99", // U+2019 right single quotation mark "\xC2\x93" => "\xE2\x80\x9C", // U+201C left double quotation mark "\xC2\x94" => "\xE2\x80\x9D", // U+201D right double quotation mark "\xC2\x95" => "\xE2\x80\xA2", // U+2022 bullet "\xC2\x96" => "\xE2\x80\x93", // U+2013 en dash "\xC2\x97" => "\xE2\x80\x94", // U+2014 em dash "\xC2\x98" => "\xCB\x9C", // U+02DC small tilde "\xC2\x99" => "\xE2\x84\xA2", // U+2122 trade mark sign "\xC2\x9A" => "\xC5\xA1", // U+0161 latin small letter s with caron "\xC2\x9B" => "\xE2\x80\xBA", // U+203A single right-pointing angle quotation mark "\xC2\x9C" => "\xC5\x93", // U+0153 latin small ligature oe "\xC2\x9E" => "\xC5\xBE", // U+017E latin small letter z with caron "\xC2\x9F" => "\xC5\xB8", // U+0178 latin capital letter y with diaeresis ); $chr = array_keys ($normalization_map); // but: for efficiency you should $rpl = array_values($normalization_map); // pre-calculate these two arrays $str = str_replace($chr, $rpl, $str);