weather.php

<?php

function get_client_ip() {
     $ipaddress = '';
     if (getenv('HTTP_CLIENT_IP'))
         $ipaddress = getenv('HTTP_CLIENT_IP');
     else if(getenv('HTTP_X_FORWARDED_FOR'))
         $ipaddress = getenv('HTTP_X_FORWARDED_FOR');
     else if(getenv('HTTP_X_FORWARDED'))
         $ipaddress = getenv('HTTP_X_FORWARDED');
     else if(getenv('HTTP_FORWARDED_FOR'))
         $ipaddress = getenv('HTTP_FORWARDED_FOR');
     else if(getenv('HTTP_FORWARDED'))
        $ipaddress = getenv('HTTP_FORWARDED');
     else if(getenv('REMOTE_ADDR'))
         $ipaddress = getenv('REMOTE_ADDR');
     else
         $ipaddress = 'UNKNOWN';
     return $ipaddress; 
}

$ip = get_client_ip(); // the IP address to query

//test ip
//$ip = "180.76.6.19";

$query = @unserialize(file_get_contents('http://ip-api.com/php/'.$ip));
if($query && $query['status'] == 'success') {
  //get Coords
  $lat = $query['lat'];
  $lon = $query['lon'];

  $url = "http://api.openweathermap.org/data/2.5/weather?lat={$lat}&lon={$lon}";

  	$djson = file_get_contents($url);
	echo $djson;

} else {
  	$url = "http://api.openweathermap.org/data/2.5/weather?q=Paris";
  	$djson = file_get_contents($url);
	echo $djson;
}
?>