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<?php
function getPopularCourses($conn, $limit = 3) {
$sql = "SELECT c.*, cat.name as category_name, i.name as instructor_name
FROM courses c
LEFT JOIN categories cat ON c.category_id = cat.id
LEFT JOIN instructors i ON c.instructor_id = i.id
WHERE c.is_popular = 1
ORDER BY c.created_at DESC
LIMIT ?";
$stmt = $conn->prepare($sql);
$stmt->bind_param("i", $limit);
$stmt->execute();
return $stmt->get_result();
}
function getCourseDetails($conn, $course_id) {
$sql = "SELECT c.*, cat.name as category_name, i.name as instructor_name, i.bio as instructor_bio, i.expertise as instructor_expertise
FROM courses c
LEFT JOIN categories cat ON c.category_id = cat.id
LEFT JOIN instructors i ON c.instructor_id = i.id
WHERE c.id = ?";
$stmt = $conn->prepare($sql);
$stmt->bind_param("i", $course_id);
$stmt->execute();
return $stmt->get_result()->fetch_assoc();
}
function addToCart($conn, $user_id, $course_id) {
// Check if already in cart
$check_sql = "SELECT id FROM cart WHERE user_id = ? AND course_id = ?";
$check_stmt = $conn->prepare($check_sql);
$check_stmt->bind_param("ii", $user_id, $course_id);
$check_stmt->execute();
if($check_stmt->get_result()->num_rows > 0) {
return false; // Already in cart
}
$sql = "INSERT INTO cart (user_id, course_id) VALUES (?, ?)";
$stmt = $conn->prepare($sql);
$stmt->bind_param("ii", $user_id, $course_id);
return $stmt->execute();
}
function getCartItems($conn, $user_id) {
$sql = "SELECT c.*, cart.id as cart_id
FROM cart
JOIN courses c ON cart.course_id = c.id
WHERE cart.user_id = ?";
$stmt = $conn->prepare($sql);
$stmt->bind_param("i", $user_id);
$stmt->execute();
return $stmt->get_result();
}
function removeFromCart($conn, $cart_id, $user_id) {
$sql = "DELETE FROM cart WHERE id = ? AND user_id = ?";
$stmt = $conn->prepare($sql);
$stmt->bind_param("ii", $cart_id, $user_id);
return $stmt->execute();
}
?>