通过file_get_contents发送url参数返回nothig

Question

I am trying to scrape a website in order to get latitude and longitude for counties in the us(there are 3306 thus why I am trying to do it through code and not manually)

I am using the code below

function GetLatitude($countyName,$stateShortName){
        //Create DOM from url
        $page = file_get_contents("https://www.mapdevelopers.com/geocode_tool.php?$countyName,$stateShortName");
        $doc = new DOMDocument();
        $doc->loadHTML($page);
        $node = $doc->getElementById("display_lat");

        var_dump($doc);
    }

    GetLatitude("Guilford County","NC");

This returns nothing but if I change the url to get without the parameters like " https://www.mapdevelopers.com/geocode_tool.php " then I can see that $doc now has some information in it but that is not useful because the value I need (latitude) is dependent upon the parameters passed into the url.

How do I solve this issue?

EDIT:

Based on the suggestion to encode the parameters I changed my code to this and now the document contains information but appears as though it is ignoring the parameters

<?
function GetLatitude($countyName,$stateShortName){
    $countyName = urlencode($countyName);
    $stateShortName = urlencode($stateShortName);
    //Create DOM from url
    $page = file_get_contents("https://www.mapdevelopers.com/geocode_tool.php?address=$countyName,$stateShortName");
    $doc = new DOMDocument();
    $doc->loadHTML($page);
    $node = $doc->getElementById("display_lat");

    var_dump($doc);
    }

    GetLatitude("Clarke County","AL");
?>

Answer 1

Your issue is that the latitude information etc isn't present on page load, and java script puts it there

You're going to have a hard time trying to run a webpage with JS and scraping it from PHP without something in the middle, maybe re-try this project with something like puppet or phantomjs so you can run your script against a real browser.

Answer 2

搜索页面上有一个对https://www.mapdevelopers.com/data.php的ajax请求。发送POST或GET请求将为您提供所需的响应