How can PHP developers utilize control structures like if-else statements to control user access to certain parts of a website?

PHP developers can utilize control structures like if-else statements to control user access to certain parts of a website by checking the user's credentials or role before allowing access. By using conditional statements, developers can determine if a user is authorized to view or interact with specific content or features on the website. 

<?php
// Check if user is logged in and has the necessary role to access a certain page
if(isset($_SESSION['user_id']) && $_SESSION['user_role'] == 'admin'){
    // Allow access to admin-only page
    include 'admin_page.php';
} else {
    // Redirect user to login page or show an access denied message
    header('Location: login.php');
    exit();
}
?>

Keywords

PHP control structures if-else statements user access control website.

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