$url =  'https://txtria.net/api/getstates'; 
$data = array(
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
$response = curl_exec($ch);
curl_close($ch);
echo $response;

{
    "success": "1",
    "data": [
        {
            "AB": "Alberta",
            "AK": "Alaska",
            "AL": "Alabama",
            "AR": "Arkansas",
            "AZ": "Arizona"
        }
    ]
}