php - get_headers() used on live site is not returning any array but on localhost it is -


when use function get_headers($url) $url = "https://www.example.com/product.php?id=15" on live site not returning array given url. nothing. when same code used on localhost, following:

array (     [0] => http/1.1 200 ok     [1] => cache-control: private     [2] => content-type: text/html; charset=utf-8     [3] => server: microsoft-iis/8.5     [4] => set-cookie: asp.net_sessionid=wumg0dyscw3c4pmaliwehwew; path=/; httponly     [5] => x-aspnetmvc-version: 4.0     [6] => x-aspnet-version: 4.0.30319     [7] => x-powered-by: asp.net     [8] => date: fri, 18 aug 2017 13:06:18 gmt     [9] => connection: close     [10] => content-length: 73867 )

so, why function not working on live?

edit

<?php  if(isset($_post['prdurl'])) {     $url = $_post['prdurl'];      print_r(get_headers($url)); // not getting array on live on localhost      if(is_array(@get_headers($url)))     {         // code goes here...     }     else     {         echo "url doesn't exist!"     } }  ?>

one more thing note down here i'm using file_get_html retrieve html page remote url. it's working on localhost not on live well.

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