What are common pitfalls when trying to implement AJAX in PHP applications?

Common pitfalls when implementing AJAX in PHP applications include not properly handling errors, not sanitizing user input, and not securing the server-side code. To avoid these pitfalls, always validate and sanitize user input, handle errors gracefully, and implement proper security measures such as using prepared statements to prevent SQL injection attacks. 

// Example of sanitizing user input using PHP filter_var function
$input = $_POST['input'];
$sanitized_input = filter_var($input, FILTER_SANITIZE_STRING);

// Example of handling errors and returning JSON response
if ($error) {
    $response = array('error' => 'An error occurred');
} else {
    $response = array('success' => 'Data saved successfully');
}

header('Content-Type: application/json');
echo json_encode($response);

Keywords

AJAX PHP applications asynchronous XMLHttpRequest error handling

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