html实体分为alpha entities(named entities)和numeric entities,php函数htmlspecialchars、htmlentities都只能转化为alpha entities,如果要转化为numeric entities要使用mb_encode_numericentity函数,如转化为gbk编码的numeric entities:
$str="(王贯)'
$convmap=array(0x0,0xffff,0,0xffff);
$str=mb_encode_numericentity($str, $convmap,'gbk');
输出:(??疮)'
更新:
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Numeric Character Reference (简称:NCR):
Character entities references :
十进制的65279(16进制的0xFEFF) 是Unicode编码中的传输控制字符
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