【python】or【php】网页中字符编码转换，将反斜杠u \u字符串转为unicode/utf8

In [23]: s1
Out[23]: '\\u003C\\u0066\\u0072\\u006F\\u006D\\u003E'
In [24]: s2
Out[24]: '%u003c%u0062%u0072%u003e%u003c%u0064%u0069%u0076%u0020%u0063%u006c......'
In [25]: print s1.decode('unicode-escape')
<from>
In [26]: print s2.replace("%", "\\").decode('unicode-escape')
<br><div cl......

def to_chinese(unicode_str):
    x = json.loads('{"chinese":"%s"}' % unicode_str)
    return x['chinese']

$str = preg_replace("/\\\\u([0-9a-f]{3,4})/i", "&#x\\1;", $str);
$str = html_entity_decode($str, null, 'UTF-8');