How to Check if a Customer Has Made a Previous Purchase in WooCommerce?

Checking Customer Purchase History in WooCommerce

In WooCommerce, it's often necessary to determine whether a customer has made any previous purchases. This information can be utilized to offer personalized discounts, rewards, or other promotions based on purchase history.

Solution

The following function, has_bought(), efficiently checks if a given customer has any paid orders in WooCommerce:

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:

This function can be utilized in various ways to check the purchase history of logged-in users and guests:

• Checking for any purchase:

  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>';

• Checking for a specific user by ID:

  $user_id = 85;
  
  if( has_bought( $user_id ) )
        echo '<p>customer have already made a purchase</p>';
    else
        echo '<p>Customer with 0 purchases</p>';

• Checking for a guest user by 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>'

Additional Note:

This function has been enhanced for improved accuracy and security, including the handling of guest users based on billing email. It has been tested on WooCommerce 3 and should work on earlier versions as well.

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