Forces the insertion of your affiliate ID into the affiliate link even if the Datafeedr API plugin has been deactivated or uninstalled. [datafeedr][dfrapi][dfrpswc]

force-insert-affiliate-id-plugins-deactivated.php

<?php

/**
 * Forces the insertion of your affiliate ID into the affiliate link even
 * if the Datafeedr API plugin has been deactivated or uninstalled.
 *
 * This should be added to your My Custom Code plugin.
 * @link https://datafeedrapi.helpscoutdocs.com/article/32-creating-your-own-custom-plugin
 *
 * @see mycode_dfrapi_url()
 *
 * @param string $url The URL for the External product.
 * @param WC_Product $product
 *
 * @return string Updated $url.
 */
add_filter( 'woocommerce_product_get_product_url', 'mycode_force_insert_affiliate_id', 20, 2 );
function mycode_force_insert_affiliate_id( $url, WC_Product $product ) {

	if ( ! is_a( $product, 'WC_Product_External' ) ) {
		return $url;
	}

	$post_id = $product->get_id();

	$dfrps_product = get_post_meta( $post_id, '_dfrps_product', true );

	if ( empty( $dfrps_product ) ) {
		return $url;
	}

	$url = mycode_dfrapi_url( $dfrps_product );

	return $url;
}

/**
 * This inserts the affiliate ID into a product's URL.
 *
 * @see dfrapi_url() in the Datafeedr API plugin.
 * @link https://plugins.trac.wordpress.org/browser/datafeedr-api/trunk/functions/functions.php
 *
 * @param array $product Datafeedr product array.
 *
 * @return string Affiliate link with affiliate ID and optionally tracking ID.
 */
function mycode_dfrapi_url( $product ) {

	// Get all the user's selected networks.
	$networks = (array) get_option( 'dfrapi_networks' );

	// Extract the affiliate ID from the $networks array.
	$affiliate_id = ( isset( $networks['ids'][ $product['source_id'] ]['aid'] ) ) ? $networks['ids'][ $product['source_id'] ]['aid'] : '';
	$affiliate_id = trim( $affiliate_id );

	// Extract the Tracking ID from the $networks array.
	$tracking_id = ( isset( $networks['ids'][ $product['source_id'] ]['tid'] ) ) ? $networks['ids'][ $product['source_id'] ]['tid'] : '';
	$tracking_id = trim( $tracking_id );

	// Determine which URL field to get: 'url' OR 'ref_url'. Return 'url' if $tracking_id is empty, otherwise, use 'ref_url'.
	$url = ( $tracking_id == '' ) ? $product['url'] : $product['ref_url'];

	// Replace placeholders in URL.
	$placeholders = array( "@@@", "###" );
	$replacements = array( $affiliate_id, $tracking_id );
	$url          = str_replace( $placeholders, $replacements, $url );

	return $url;
}