What is the relationship between AJAX and PHP in terms of client-side and server-side execution?

AJAX is a technology that allows client-side scripts to communicate with a server asynchronously, meaning that the client-side code can make requests to the server without needing to reload the entire page. PHP is a server-side scripting language commonly used for handling server-side logic and generating dynamic web content. When using AJAX with PHP, the client-side code (usually written in JavaScript) sends requests to the server, where PHP scripts process the requests and return data back to the client. 

<?php
// Sample PHP code to handle AJAX request and return data
if(isset($_POST['data'])){
    $data = $_POST['data'];
    
    // Process the data as needed, e.g. query a database
    $result = processData($data);
    
    // Return the result back to the client
    echo json_encode($result);
}

function processData($data){
    // Perform some logic with the data
    return "Processed: " . $data;
}
?>

Keywords

AJAX PHP client-side server-side execution

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