Display all Woocommerce products eligible for coupons created with Woocommerce

wc-display-all-products-eligible-for-coupons.php

<?php
/*
URL: https://wproot.dev/blog/woocommerce-display-all-products-eligible-for-coupons/
*/

$args = array(
    'posts_per_page'   => -1, //show all posts
    'post_type'        => 'shop_coupon', //custom post type
    'post_status'      => 'publish', //published coupons only
);
$coupons = get_posts( $args ); //array

$coupon_ids = array();
 
foreach ( $coupons as $coupon ) {
    $coupon_id = $coupon->ID;
 
    $expdate = get_post_meta($coupon_id, 'expiry_date', true);
    $today = date('Y-m-d');
    
    if ( strtotime($expdate) > strtotime($today) ){
    array_push( $coupon_ids, $coupon_id ); //push all coupon id into an array
    }
}

$n = 1;
 
foreach ( $coupon_ids as $active_coupon_id ) {
    ${'coupon'.$n.'_prod_ids'} = array();
    $str = get_post_meta($active_coupon_id, 'product_ids', true);
	//str is NOT an array, product ids are stored like so: '10,15,24'.
    ${'coupon'.$n.'_prod_ids'} = explode(",",$str);
    $n++;
}

$product_ids_with_coupons = array();
 
$i = 1;
 
while ($i < $n) {
    foreach ( ${'coupon'.$i.'_prod_ids'} as ${'coupon'.$i.'_prod_id'} ) {
		array_push($product_ids_with_coupons, ${'coupon'.$i.'_prod_id'});
    }
    $i++;
}

/* Usage example */

if ( $product->product_type == 'simple' ) {
				    
	$product_obj = new WC_Product($currentpostid);
				    
	foreach ( $product_ids_with_coupons as $product_id_with_coupon ) {
		if ($product_id_with_coupon == $currentpostid) { 
			//do something here like displaying a 'discount with coupon' image
			break;
		}
	}
}

?>