connecting Wemos D1 R1 to my website

I would like to control a relay using Wemos D! R1 via a website from anywhere. I managed to control it using local web server and now would like to step it up further.

I’m using the following code which connects to this website and retrieve data as JSON perfectly.

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>

const char* ssid = "SSID";
const char* password = "PASS";
 
void setup () {
	Serial.begin(115200);
	WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
		delay(1000);
		Serial.print(".");
    }
}
 
void loop() {
	if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status
		Serial.println("");                     
		HTTPClient http;  //Declare an object of class HTTPClient
		http.begin("http://jsonplaceholder.typicode.com/users/1");  //Specify request destination
		int httpCode = http.GET();                                                                  //Send the request
	 
		if (httpCode > 0) { //Check the returning code
			String payload = http.getString();   //Get the request response payload
			Serial.println("");                  // Empty Line
			Serial.println(payload);             //Print the response payload
			//////////////// Json code
			  StaticJsonDocument<2000> doc; 
			  DeserializationError error = deserializeJson(doc, payload);
			  if (error) {
				Serial.print(F("deserializeJson() failed: "));
				Serial.println(error.c_str());
				return;
			  }
			  const char* sensor = doc["name"];
			  const char* username = doc["username"];
			  const char* email = doc["email"];
			  const char* address = doc["address"];
			  Serial.println(sensor);
			  Serial.println(username);
			  Serial.println(email);
			  Serial.println(address);
			//////////////// End of Json Code
			  http.end();   //Close connection
			  while ( 0 < 1 ){ delay(10000); }  // to break the loop
			}
	}
	delay(10);    //Send a request every 30 seconds
}

I made a web page that makes AJAX call to a PHP file to retrieve data from MYSQL DB, but when I run it, the monitor keeps printing empty lines forever although connected successfully to my WIFI.

$(document).ready(function(){
$.ajax({
        url: "test.php",
        type: 'GET',
        dataType: 'json', // added data type
	data: ({mobile: 'hi'}),
        success: function(res) {
            console.log(res);
        }
    });
});

The result I’m getting from AJAX is (which you can check visiting this link:

    {"status":"ON"}

I’m using the following code on php file:

<?php 
header('Content-type: application/json');	
require 'functions.php'; 
header("Access-Control-Allow-Origin: *");
	$catrecord = mysqli_query($link,"SELECT * FROM `ard`");
		while($catinfo = mysqli_fetch_array($catrecord, MYSQLI_ASSOC)){ $Cat = $catinfo['status']; }
	$responseArray = array('status' => $Cat );			

if (!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
	$encoded = json_encode($responseArray);		
	header('Content-Type: application/json');	
	echo $encoded;
} else {    
	echo $responseArray['status'];		
}
?>