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Filename : wishlist_handler.php

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<?php
include 'config.php';
session_start();
$user_id = $_SESSION['user_id'];

$product_id = $_POST['product_id'];

// Check if already in wishlist
$check = mysqli_query($conn, "SELECT * FROM product_wishlist WHERE user_id = '$user_id' AND product_id = '$product_id'");
if (mysqli_num_rows($check) > 0) {
    mysqli_query($conn, "DELETE FROM product_wishlist WHERE user_id = '$user_id' AND product_id = '$product_id'");
    echo "removed";
} else {
    mysqli_query($conn, "INSERT INTO product_wishlist (user_id, product_id) VALUES ('$user_id', '$product_id')");
    echo "added";
}
?>