Are there best practices for handling browser interactions in PHP applications?

When handling browser interactions in PHP applications, it is important to sanitize and validate user input to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. Additionally, using proper headers to prevent caching and ensuring secure communication over HTTPS are best practices to follow. 

// Sanitize and validate user input
$userInput = filter_input(INPUT_POST, 'user_input', FILTER_SANITIZE_STRING);

// Prevent caching by setting appropriate headers
header("Cache-Control: no-cache, no-store, must-revalidate");
header("Pragma: no-cache");
header("Expires: 0");

// Ensure secure communication over HTTPS
if (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] !== 'on') {
    header('Location: https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
    exit;
}

Keywords

AJAX JavaScript jQuery HTTP headers session management

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