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function  file_get_contents Unable to resolve the domain name such as "abc123.1688.com",it's resolve to 127.0.0.1

Then that's your problem: the domain name is resolving to 127.0.0.1. Fix that and it should start working for you.

D:\Documents and Settings\Administrator>ping shjianbang168.1688.com

Pinging cn.split.1688.com [42.156.140.61] with 32 bytes of data:

Reply from 42.156.140.61: bytes=32 time=35ms TTL=54
Reply from 42.156.140.61: bytes=32 time=30ms TTL=54
Reply from 42.156.140.61: bytes=32 time=36ms TTL=54
Reply from 42.156.140.61: bytes=32 time=36ms TTL=54

Ping statistics for 42.156.140.61:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 30ms, Maximum = 36ms, Average = 34ms

use "Mozilla Firefox" or "Internet Explorer" view "http://shjianbang168.1688.com/" is ok, 
but use file_get_contents("http://shjianbang168.1688.com/") is not same to the Firefox or IE.
use PHP file_get_contents("http://shjianbang168.1688.com/") is same to "Firefox view http://127.0.0.1/"(I have localhost server, so i can test PHP script)

Not sure what I can tell you except that if PHP is sending you to 127.0.0.1 then that's because something told it to.

As one more thing to check, see what you get with
  print_r(dns_get_record("shjianbang168.1688.com"));
  print_r(get_headers("http://shjianbang168.1688.com/"));

If that doesn't help then try a mailing list or online forum for more support.
http://php.net/support.php

my function get_url is use fsockopen, get the content of html is same to IE html code.a1.txt it's OK.

function file_get_contents get content of html is error! 

$url="http://shjianbang168.1688.com/";
$st=file_get_contents($url);
if ($st){
    file_put_contents("./a.txt", $st); 
    echo "OK<br>";	
}else{
    echo "error<br>"; 
}

get_url($header, $st,  "shjianbang168.1688.com", "/");
if ($st){
    file_put_contents("./a2.txt", $st); 
    echo "OK2<br>";	
}else{
    echo "error2<br>"; 
}


  print_r(dns_get_record("shjianbang168.1688.com"));

Array
(
    [0] => Array
        (
            [host] => shjianbang168.1688.com
            [class] => IN
            [ttl] => 600
            [type] => CNAME
            [target] => cn.1688.com
        )

)

  print_r(get_headers("http://shjianbang168.1688.com/"));
Array
(
    [0] => HTTP/1.1 302 Found
    [1] => Date: Wed, 06 Aug 2014 00:58:21 GMT
    [2] => Server: Apache
    [3] => Location: http://127.0.0.1/
    [4] => Vary: Accept-Encoding
    [5] => Content-Length: 201
    [6] => Connection: close
    [7] => Content-Type: text/html; charset=iso-8859-1
    [8] => HTTP/1.1 200 OK
    [9] => Date: Wed, 06 Aug 2014 00:58:12 GMT
    [10] => Server: Apache/2.2.25
    [11] => X-Powered-By: PHP/5.4.31
    [12] => Vary: Accept-Encoding
    [13] => Connection: close
    [14] => Content-Type: text/html
)

function get_url(&$header, &$content, $ahost, $url){
	$header="";	$content="";
	$fp = fsockopen($ahost, 80, $errno, $errstr, 30);
	if ($fp) {
		$out  = "GET $url HTTP/1.1\r\n";
		$out .= "Host: $ahost\r\n";
		$out .= "Referer: http://$ahost/\r\n";
		$out .= "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2;)\r\n";
		//$out .= "Accept-Encoding: gzip,deflate\r\n";
		$out .= "Connection: Close\r\n\r\n";
		fwrite($fp, $out);
		$content="";
		while (!feof($fp)) {
			$content.= fgets($fp);
		}
		fclose($fp);
		$pos=stripos($content, "\r\n\r\n");
		if ($pos>0){
			$header=substr($content, 0, $pos);
			$content=substr($content, $pos+4);
		}
		if (stripos($header, "Transfer-Encoding: chunked")!==false)
			$content=http_chunked_decode($content);
		return true;
	} else {
		$content=false;
		return false;
	}
}

The get_headers() output shows that PHP is being redirected to 127.0.0.1. Why? You'd have to ask them.

So not a bug.