How to Determine if a Customer Has Made a Purchase in WooCommerce?

How to Verify if a Customer Has Made a Purchase in WooCommerce

In WooCommerce, providing incentives to loyal customers who have previously purchased is a common practice. To effectively implement such strategies, it becomes necessary to verify if a customer has made any purchases before.

Checking Purchase History

To ascertain a customer's purchase history, WooCommerce provides a light and efficient conditional function called has_bought(). This function analyzes customer data to determine whether they have previously made a purchase.

The function handles both registered users and guests:

• Registered users: If no user ID is specified, the function uses the ID of the currently logged-in user.
• Guests: For guests, the function requires their billing email as an argument.

Implementing the Function

function has_bought( $value = 0 ) {
    if ( ! is_user_logged_in() && $value === 0 ) {
        return false;
    }

    global $wpdb;

    // Based on user ID (registered users)
    if ( is_numeric( $value) ) { 
        $meta_key   = '_customer_user';
        $meta_value = $value == 0 ? (int) get_current_user_id() : (int) $value;
    } 
    // Based on billing email (Guest users)
    else { 
        $meta_key   = '_billing_email';
        $meta_value = sanitize_email( $value );
    }
    
    $paid_order_statuses = array_map( 'esc_sql', wc_get_is_paid_statuses() );

    $count = $wpdb->get_var( $wpdb->prepare("
        SELECT COUNT(p.ID) FROM {$wpdb->prefix}posts AS p
        INNER JOIN {$wpdb->prefix}postmeta AS pm ON p.ID = pm.post_id
        WHERE p.post_status IN ( 'wc-" . implode( "','wc-", $paid_order_statuses ) . "' )
        AND p.post_type LIKE 'shop_order'
        AND pm.meta_key = '%s'
        AND pm.meta_value = %s
        LIMIT 1
    ", $meta_key, $meta_value ) );

    // Return a boolean value based on orders count
    return $count > 0;
}

Usage Examples

Logged-in Customer:

if( has_bought() )
    echo '<p>You have already made a purchase</p>';
else
    echo '<p>Welcome, for your first purchase you will get a discount of 10%</p>';

Guest with Billing Email:

$email = '[email protected]';
if( has_bought( $email ) )
        echo '<p>customer have already made a purchase</p>';
    else
        echo '<p>Customer with 0 purchases</p>'

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