Woocommerce – add products automatically to cart on visit

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Today i am going to share one of the feature which my client asked to me, and that is to add the product automatically once the visitor viewed that product. Hope this will help someone who is having requirement like this.

* To be added on theme's functions.php or a custom plugin
// add products automatically to cart on visit
add_action( 'init', 'add_product_to_cart' );
function add_product_to_cart() {
if ( ! is_admin() ) {
global $woocommerce;
$product_id = 64;
$found = false;
//check if product already in cart
if ( sizeof( $woocommerce->cart->get_cart() ) > 0 ) {
foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values ) {
$_product = $values['data'];
if ( $_product->id == $product_id )
$found = true;
}
// if product not found, add it
if ( ! $found )
$woocommerce->cart->add_to_cart( $product_id );
} else {
// if no products in cart, add it
$woocommerce->cart->add_to_cart( $product_id );
}
}
}