PHP curl返回空白字符串

Question

I started off using file_get_contents() and it returned string(9259) in which every character is a space (aka. its a lot of empty). After some research I tried using curl() and after a few struggles with getting the CURLOPT_SSL_VERIFYPEER and CURLOPT_USERAGENT to work it brought me right back to where I was, string(9259) of all blank.

I am attempting to retrieve the tracking information on multiple packages automatically and the code for a single iteration is as follows:

function curl($url)
    {
        $ch = curl_init();
        curl_setopt( $ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.52 Safari/537.17' );
        curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false  );
        curl_setopt( $ch, CURLOPT_URL, $url );
        curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
        $data = curl_exec( $ch );
        var_dump( curl_getinfo( $ch ) );
        echo curl_errno( $ch ) . '<br/>';
        echo curl_error( $ch ) . '<br/>';
        curl_close( $ch );
        return $data;
    }

$url for one instance is https://www.fedex.com/fedextrack/?tracknumbers=055575670028673&cntry_code=us

My question is essentially why am I receiving the string(9259) of blank characters? I expected to receive an actual string representation of the website.

Answer 1

Maybe Fedex doesn't like it when you scrape pages, has detected that you are doing so, and is returning dummy data?

They do have APIs for this: http://www.fedex.com/us/developer/web-services/index.html