Check if a user has purchased specific products in WooCommerce

Lighter and improved code version in HERE that handle multiple product IDs

Updated (compatibility for Woocommerce 3+)

Yes it's possible, writing a conditional function that returns "true" if current customer has already bought specifics defined products IDs. This code goes on function.php file of your active child theme or theme.

Here is the conditional function:

function has_bought_items() {
    $bought = false;

    // Set HERE ine the array your specific target product IDs
    $prod_arr = array( '21', '67' );

    // Get all customer orders
    $customer_orders = get_posts( array(
        'numberposts' => -1,
        'meta_key'    => '_customer_user',
        'meta_value'  => get_current_user_id(),
        'post_type'   => 'shop_order', // WC orders post type
        'post_status' => 'wc-completed' // Only orders with status "completed"
    ) );
    foreach ( $customer_orders as $customer_order ) {
        // Updated compatibility with WooCommerce 3+
        $order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;
        $order = wc_get_order( $customer_order );

        // Iterating through each current customer products bought in the order
        foreach ($order->get_items() as $item) {
            // WC 3+ compatibility
            if ( version_compare( WC_VERSION, '3.0', '<' ) ) 
                $product_id = $item['product_id'];
            else
                $product_id = $item->get_product_id();

            // Your condition related to your 2 specific products Ids
            if ( in_array( $product_id, $prod_arr ) ) 
                $bought = true;
        }
    }
    // return "true" if one the specifics products have been bought before by customer
    return $bought;
}

This code is tested and works.

USAGE:
For example, you can use it in some WooCommerce templates that you will have previously copied to your active child theme or theme:

The template for Shop page concerning add-to-cart button is loop/add-to-cart.php.
The templates for Product pages concerning add-to-cart button are in single-product/add-to-cart folder depending on your product types.

Here is an example that you could use in those templates (above):

// Replace the numbers by your special restricted products IDs
$restricted_products = array( '20', '32', '75' );

// compatibility with WC +3
$product_id = method_exists( $product, 'get_id' ) ? $product->get_id() : $product->id;

// customer has NOT already bought a specific product for this restricted products
if ( !has_bought_items() && in_array( $product_id, $restricted_products ) ) { 

    // Displaying an INACTIVE add-to-cart button (With a custom text, style and without the link).
    // (AND optionally) an explicit message for example.

// ALL OTHER PRODUCTS OR RESTRICTED PRODUCTS IF COSTUMER HAS ALREADY BOUGHT SPECIAL PRODUCTS
} else { 

    // place for normal Add-To-Cart button code here
}

And here the complete applied example to add-to-cart button template on Shop page:

<?php
/**
 * Loop Add to Cart
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/loop/add-to-cart.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see         https://docs.woocommerce.com/document/template-structure/
 * @author      WooThemes
 * @package     WooCommerce/Templates
 * @version     2.5.0
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

global $product;

// Replace the numbers by your special restricted products IDs
$restricted_products = array( '37', '53', '70' );

// compatibility with WC +3
$product_id = method_exists( $product, 'get_id' ) ? $product->get_id() : $product->id;

if ( !has_bought_items() && in_array( $product_id, $restricted_products ) ) {

    echo '<a class="button greyed_button">' . __("Disabled", "your_theme_slug") . '</a>';
    echo '<br><span class="greyed_button-message">' . __("Your message goes here…", "your_theme_slug") . '</span>';

} else {

echo apply_filters( 'woocommerce_loop_add_to_cart_link',
    sprintf( '<a rel="nofollow" href="%s" data-quantity="%s" data-product_id="%s" data-product_sku="%s" class="%s">%s</a>',
        esc_url( $product->add_to_cart_url() ),
        esc_attr( isset( $quantity ) ? $quantity : 1 ),
        esc_attr( $product_id ),
        esc_attr( $product->get_sku() ),
        esc_attr( isset( $class ) ? $class : 'button' ),
        esc_html( $product->add_to_cart_text() )
    ),
$product );

}

You will style the inactive button with greyed_button class in the style.css file of your active child theme or theme. Same thing for the message with greyed_button-message class.

2020 update: Now handles guest users from their billing email.

New version compact, lighter, faster and compatible with all versions of woocommerce (from version 2.4 and above)

This is a new enhanced and lighter conditional function partially based on built-in woocommerce function wc_customer_bought_product source code.

There are 2 optional arguments:

$user_var will allow you to:

specify a defined user ID (when is not used for current logged in user)
or the billing email for guests users;
$product_ids (array) will allow to specify one or multiple product Ids to check

Here is that code:

function has_bought_items( $user_var = 0,  $product_ids = 0 ) {
    global $wpdb;
    
    // Based on user ID (registered users)
    if ( is_numeric( $user_var) ) { 
        $meta_key     = '_customer_user';
        $meta_value   = $user_var == 0 ? (int) get_current_user_id() : (int) $user_var;
    } 
    // Based on billing email (Guest users)
    else { 
        $meta_key     = '_billing_email';
        $meta_value   = sanitize_email( $user_var );
    }
    
    $paid_statuses    = array_map( 'esc_sql', wc_get_is_paid_statuses() );
    $product_ids      = is_array( $product_ids ) ? implode(',', $product_ids) : $product_ids;

    $line_meta_value  = $product_ids !=  ( 0 || '' ) ? 'AND woim.meta_value IN ('.$product_ids.')' : 'AND woim.meta_value != 0';

    // Count the number of products
    $count = $wpdb->get_var( "
        SELECT COUNT(p.ID) FROM {$wpdb->prefix}posts AS p
        INNER JOIN {$wpdb->prefix}postmeta AS pm ON p.ID = pm.post_id
        INNER JOIN {$wpdb->prefix}woocommerce_order_items AS woi ON p.ID = woi.order_id
        INNER JOIN {$wpdb->prefix}woocommerce_order_itemmeta AS woim ON woi.order_item_id = woim.order_item_id
        WHERE p.post_status IN ( 'wc-" . implode( "','wc-", $paid_statuses ) . "' )
        AND pm.meta_key = '$meta_key'
        AND pm.meta_value = '$meta_value'
        AND woim.meta_key IN ( '_product_id', '_variation_id' ) $line_meta_value 
    " );

    // Return true if count is higher than 0 (or false)
    return $count > 0 ? true : false;
}

Code goes in functions.php file of your active child theme (or theme) or also in any plugin file.

This code is tested on WooCommerce 3+ and works (It should work on previous versions too).

USAGE EXAMPLES:

Example 1 (logged in customer): Detecting if current user has bought one of the defined products (product Ids needs to be an array)

// Define the targeted Products IDs
$product_ids = array( 38, 41, 85, 95 );

if( has_bought_items( '', $product_ids ) )
    echo "<p>You have already purchased one of this products</p>";
else
    echo "<p>You have not yet purchased one of this products</p>";

Example 2 (for a defined user id) Detecting if the defined user has bought one of the defined products (product Ids needs to be set in an array)

// Define the user ID
$user_id = 85;

// Define the targeted Products IDs
$product_ids = array( 38, 41, 85, 95 );

if( has_bought_items( $user_id, $product_ids ) )
    echo "<p>This user have already purchased one of this products</p>";
else
    echo "<p>This user have not yet purchased one of this products</p>";

If the $user_id is not defined and the current user is not logged in, this function will return false.

Example 3 (for guest user) Detecting if guest user has bought one of the defined products from his billing email (product Ids needs to be set in an array)

// Define guest Billing email (string)
$user_email = '[email protected]';

// Define the targeted Products IDs
$product_ids = array( 38, 41, 85, 95 );

if( has_bought_items( $user_email, $product_ids ) )
    echo "<p>This user have already purchased one of this products</p>";
else
    echo "<p>This user have not yet purchased one of this products</p>";

If the $user_id is not defined and the current user is not logged in, this function will return false.

Example 4 (logged in customer): Detecting if current user has already made a purchase

if( has_bought_items() )
    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 5 (Defining the user id) - Detecting if the defined user has already made a purchase

// Define the user ID
$user_id = 85;

if( has_bought_items( $user_id ) )
        echo '<p>customer have already made a purchase</p>';
    else
        echo '<p>Customer with 0 purshases</p>';

Now, if user id is equal to 0 and the current user is not logged in, this function will return false (if no billing email is defined for guest users).

The built-in woocommerce function wc_customer_bought_product can also be used in this case.

See function usage here.

Check if a user has purchased specific products in WooCommerce

Lighter and improved code version in HERE that handle multiple product IDs

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