php unicode编码转成unioce字符（中文）

有几个unicode编码如下：
\u4e2d\u56fd\u4eba

如果将其换成字符的形式呢？

    


	
', time());

echo '\u4e2d ';
echo iconv('UCS-2', 'UTF-8', pack('H4', '4e2d'));
echo '
';

$unicodeStr = '\u4e2d\u56fd\u4eba';
echo "$unicodeStr 
";

// 方法1，PHP5.5及之前的版本，preg_replacez在PHP5.5后过时了？
$str = preg_replace("#\\\u([0-9a-f]{4})#ie", "iconv('UCS-2BE', 'UTF-8', pack('H4', '\\1'))", $unicodeStr);
echo "方法1：$str 
";


// 方法2，PHP5.6及更高版本使用
function match_string($matches)
{
    return  iconv('UCS-2', 'UTF-8', pack('H4', $matches[1]));
    //return  iconv('UCS-2BE', 'UTF-8', pack('H4', $matches[1]));
    //return  iconv('UCS-2LE', 'UTF-8', pack('H4', $matches[1]));
}

$str = preg_replace_callback("#\\\u([0-9a-f]{4})#", 'match_string', $unicodeStr);
//$str = preg_replace_callback("/\\\u([0-9a-f]{4})/", 'match_string', $unicodeStr);
echo "方法2：$str 
";;



// 方法3，PHP5.6及更高版本使用
function replace_unicode_escape_sequence($match)
{       
		return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');     
}          
$str = preg_replace_callback('/\\\\u([0-9a-f]{4})/i', 'replace_unicode_escape_sequence', $unicodeStr);    
echo "方法3：$str 
";


?>