如何確定 WooCommerce 客戶是否有購買歷史記錄？

Determining Customer Purchase History in WooCommerce

When developing WooCommerce plugins, it often becomes necessary to check if a customer has made previous purchases. This information can be leveraged to tailor offers and promotions accordingly.

Checking Customer Purchase History

To determine if a customer has made any purchases, a lightweight and optimized function can be employed:

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

1. Checking for Registered User Purchases:

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>';

2. Checking for Guest User Purchases Based on Billing Email:

// Define the billing email (string)
$email = '[email protected]';

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

By employing this function, plugin developers can easily determine whether a customer has a purchase history in WooCommerce, enabling targeted promotions and discounts for enhanced customer engagement.

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