将Unicode编码转为汉字

//Unicode字符串

$str = \u4f55\u4ee5\u7b19\u7bab\u9ed8(\u7b2c25\u96c6)

//linux
$str=preg_replace("#\\\u([0-9a-f]{4})#ie", "iconv('UCS-2BE', 'UTF-8', pack('H4', '\\1'))", $str);

windows
$str=preg_replace("#\\\u([0-9a-f]{4})#ie", "iconv('UCS-2LE', 'UTF-8', pack('H4',pack('H4', '\\1'))", $str);