post-ajax-logic.php

<?
$curl = curl_init($url); 
curl_setopt($curl, CURLOPT_URL, "https://www.w3schools.com/jquery/demo_test_post.asp"); 
// specify that the cURL request is a POST 
curl_setopt($curl, CURLOPT_POST, true); 
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); 
 
// define the body of the request 
curl_setopt($curl, CURLOPT_POSTFIELDS, 
	// http_build_query is required to simulate 
	// a FormData request. Ignore it on a JSON request 
	http_build_query( 
		array( 
			"name" => "Donald Duck", 
			"city" => "Duckburg" 
		) 
	) 
); 
 
// define the body of the request 
curl_setopt($curl, CURLOPT_POSTFIELDS, 
	array( 
		"name" => "Donald Duck", 
		"city" => "Duckburg" 
	) 
); 
 
// replicate the AJAX call 
$result = curl_exec($curl);