How to Check if a WooCommerce User Has Made Past Purchases?

Checking Purchase History in WooCommerce

Problem:

You wish to create a WooCommerce plugin that offers exclusive deals to customers with a purchase history. The challenge is determining whether a user has made a purchase in the past.

Solution:

Checking Past Purchases for Customers

To check if a customer has made any past purchases, you can leverage a custom function that seamlessly handles both registered users and guest users:

function has_bought( $value = 0 ) {
    // Handling for registered users
    if ( is_numeric( $value) ) { 
        // Use current user ID if not provided
        $meta_key   = '_customer_user';
        $meta_value = $value == 0 ? (int) get_current_user_id() : (int) $value;
    } 
    // Handling for guest users
    else { 
        $meta_key   = '_billing_email';
        $meta_value = sanitize_email( $value );
    }
    
    global $wpdb;
    
    // Determine if any paid orders exist
    $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 true if at least one paid order exists
    return $count > 0;
}

Usage Examples:

Example 1: Check for purchases by the currently 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>';

Example 2: Check for purchases by a specific user ID

// Define the user 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>';

Example 3: Check for purchases by a guest user's 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>'

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