Automatic discount for paying customers in WooCommerce - php

Question

I want to apply a discount coupon automatically to everyone who has made at least one purchase on my website. This is the code that I tried but I get a fatal error on the page ...
function has_bought( $customer_email ){
$orders = get_posts(array(
'numberposts' => -1,
'post_type' => 'shop_order',
'post_status' => array('wc-completed'),
) );
$email_array = array();
foreach($orders as $order) {
$order_obj = wc_get_order($order->ID);
$order_obj_data = $order_obj->get_data();
array_push($email_array, $order_obj_data['billing']['email']);
}
if (in_array($customer_email, $email_array)) {
return true;
} else {
return false;
}
}
add_action( 'woocommerce_before_cart', 'apply_matched_coupons' );
function apply_matched_coupons() {
global $woocommerce;
$coupon_code = '10fidelity'; // coupon code
if ( $woocommerce->cart->has_discount( $coupon_code ) ) return;
if ( has bought() {
$woocommerce->cart->add_discount( $coupon_code );
$woocommerce->show_messages();
}
}

Answer 1

Your actual code is heavy and outdated… Instead try the following much more lighter and efficient way, that use the WC_Customer is_paying_customer property:
add_action( 'woocommerce_before_calculate_totals', 'enable_customer_fidelity_discount', 10, 1 );
function enable_customer_fidelity_discount( $cart ) {
if ( ! ( is_cart() || is_checkout() ) )
return;
if ( ( is_admin() && ! defined( 'DOING_AJAX' ) ) || ! is_user_logged_in() )
return;
if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
return;
// The discount coupon code below
$coupon_code = '10fidelity';
if( ! in_array( $coupon_code, $cart->get_applied_coupons() ) && WC()->customer->get_is_paying_customer() ) {
$cart->apply_coupon( $coupon_code );
} elseif( in_array( $coupon_code, $cart->get_applied_coupons() ) && ! WC()->customer->get_is_paying_customer() ) {
$cart->remove_coupon( $coupon_code );
}
}
Code goes in functions.php file of your active child theme (or active theme). Tested and works
Or using this improved and light function that checks if customer has already made an order:
function has_bought( $user_id = 0 ) {
global $wpdb;
$customer_id = $user_id == 0 ? get_current_user_id() : $user_id;
$paid_order_statuses = array_map( 'esc_sql', wc_get_is_paid_statuses() );
$results = $wpdb->get_col( "
SELECT p.ID FROM {$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 = '_customer_user'
AND pm.meta_value = $customer_id
" );
// Count number of orders and return a boolean value depending if higher than 0
return count( $results ) > 0 ? true : false;
}
add_action( 'woocommerce_before_calculate_totals', 'enable_customer_fidelity_discount', 10, 1 );
function enable_customer_fidelity_discount( $cart ) {
if ( ! ( is_cart() || is_checkout() ) )
return;
if ( ( is_admin() && ! defined( 'DOING_AJAX' ) ) || ! is_user_logged_in() )
return;
if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
return;
// The discount coupon code below
$coupon_code = 'summer';
if( ! in_array( $coupon_code, $cart->get_applied_coupons() ) && has_bought() ) {
$cart->apply_coupon( $coupon_code );
} elseif( in_array( $coupon_code, $cart->get_applied_coupons() ) && ! has_bought() ) {
$cart->remove_coupon( $coupon_code );
}
}
Code goes in functions.php file of your active child theme (or active theme). Tested and works.
Related:
Checking if customer has already bought something in WooCommerce
Auto apply coupon only one time per user based on total spent in WooCommerce