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There are a few ways that a response can be obtained using PHP and JavaScript:

1. AJAX (Asynchronous JavaScript and XML) can be used to make HTTP requests to a PHP script and receive a response. This can be done using the XMLHttpRequest object in JavaScript.

Example:

JavaScript code:

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
  if (this.readyState == 4 && this.status == 200) {
    console.log(this.responseText);
  }
};
xhttp.open("GET", "path/to/php/script.php", true);
xhttp.send();

PHP code:

<?php
// Do some processing here
$response = "Hello from PHP!";
echo $response;
?>

1. PHP can be used to output data in JSON format, which can be read by JavaScript using the JSON.parse() method.

Example:

JavaScript code:

fetch('path/to/php/script.php')
  .then(response => response.json())
  .then(data => console.log(data));

PHP code:

<?php
// Do some processing here
$response = array('message' => 'Hello from PHP!');
echo json_encode($response);
?>

These are just two examples of how to obtain a response using PHP and JavaScript, there are many other ways to achieve this depending on your specific use case.