function getUserIpAddr(){
    if(!empty($_SERVER['HTTP_CLIENT_IP'])){
        //ip from share internet
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    }elseif(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
        //ip pass from proxy
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    }else{
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    return $ip;
}
 
echo 'User Real IP - '.getUserIpAddr();
 
 
 
<?php
// Sample array
$data = array("a" => "Apple", "b" => "Ball", "c" => "Cat");
 
header("Content-Type: application/json");
echo json_encode($data);
exit();
?>
 
 
 
<?php
header('Content-Type: application/json'); // OR
//header('Content-Type: application/json; charset=utf-8');
 
$returned_data = array();
// process the request, database access, and add returned data to array:
// for example
$returned_data["name"]    = "Luffy";
$returned_data["email"]   = "luffy@onepiece.fandom.com";
$returned_data["profile"] = "https://onepiece.fandom.com/wiki/Monkey_D._Luffy";
 
$json = json_encode($returned_data, true); // convert array to JSON string
echo $json; // return JSON data
?>