方法一：

$url="http://www.45its.com";
file_get_contents($url);

方法二：

// CURL 方法
          $url="http://www.45its.com";
          $ch = curl_init(  );
          curl_setopt( $ch,CURLOPT_URL,$url );
          curl_setopt( $ch,CURLOPT_HEADER,0 );
          curl_setopt( $ch,CURLOPT_RETURNTRANSFER,1 );
          $ret= curl_exec( $ch );
          curl_close( $ch );
          echo $ret;

方法三：

$url="http://www.45its.com";
    $fp=fopen($url,"r");
    $response = '';
            while($row = fgets($fp)) {
                $response.= trim($row)."\n";
            }     
注意：如果ping的通但是无法调用远程url，试试wget

Resolving www.xxx.com... 114.xxx.xxx.xxx
Connecting to www.xxx.com|114.xxx.xxx.xxx|:80... connected.
HTTP request sent, awaiting response... 403 Forbidden
10:58:22 ERROR 403: Forbidden.

这样就不可以！