PHP-&#xxxxx 编码文字与UNICODE 互相转换

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//====把 "小" 转成 "小"  范例: (必须查看网页源代码)
$T = '小';
$unicode = '&#' . base_convert(bin2hex(iconv("utf-8", "ucs-4", $T)), 16, 10) . ';';
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//====把 "小" 转回 "小" 范例:
$str = mb_convert_encoding($unicode, 'UTF-8', 'HTML-ENTITIES');