Woocommerce - Check whether a page is woocommerce page

functions.php

<?php

/**
* is_really_woocommerce_page - Returns true if on a page which uses WooCommerce templates
*
* @access public
* @return bool
*/
function is_really_woocommerce_page () {
    if( function_exists ( "is_woocommerce" ) && is_woocommerce()){
        return true;
    }
    $woocommerce_keys = array ( "woocommerce_shop_page_id" ,
        "woocommerce_terms_page_id" ,
        "woocommerce_cart_page_id" ,
        "woocommerce_checkout_page_id" ,
        "woocommerce_pay_page_id" ,
        "woocommerce_thanks_page_id" ,
        "woocommerce_myaccount_page_id" ,
        "woocommerce_edit_address_page_id" ,
        "woocommerce_view_order_page_id" ,
        "woocommerce_change_password_page_id" ,
        "woocommerce_logout_page_id" ,
        "woocommerce_lost_password_page_id" ) ;

    foreach ( $woocommerce_keys as $wc_page_id ) {
        if ( get_the_ID () == get_option ( $wc_page_id , 0 ) ) {
            return true ;
        }
    }
    return false;
}

add_action('wp_head', 'is_really_woocommerce_page');

?>