Fix permalink of categories matching primary category in aio seo plugin (All in One SEO Pack)

functions.php

<?php
/*
 * Author: https://github.com/olex0r
 *
 * Fix permalink of categories matching primary category in aio seo plugin (All in One SEO Pack)
 * This code snippet is a WordPress filter that modifies the permalink (URL) of product categories
 * in the WooCommerce plugin when the "All in One SEO Pack" (AIO SEO) plugin is active. It ensures
 * that the permalink for a category matches the primary category set by the AIO SEO plugin
 * for a specific product.
 *
 * Add this code to your theme's functions.php file.
 */

add_filter( 'wc_product_post_type_link_product_cat', function ( $term, $terms, $post ) {
	// Get the primary term as saved by AIO SEO

	// If AIOSEO\Plugin\Common\Models\Post doesn't exist, then we are not using AIO SEO
	if ( ! class_exists( 'AIOSEO\Plugin\Common\Models\Post' ) ) {
		return $term;
	}

	// Use native AIO SEO getPost
	$aioseoPost   = AIOSEO\Plugin\Common\Models\Post::getPost( $post->ID );
	$primaryTerms = ! empty( $aioseoPost->primary_term ) ? $aioseoPost->primary_term : false;
	$taxonomyName = 'product_cat';

	// If there is no primary term, or the primary term is not set for this taxonomy
	if ( ! $primaryTerms || empty( $primaryTerms->{$taxonomyName} ) ) {
		return $term;
	}

	// Get the primary term ID
	$primary_cat_id = $primaryTerms->{$taxonomyName};

	// If there is a primary, and it's not currently chosen as primary
	if ( $term->term_id != $primary_cat_id ) {
		// Find the primary term in the term list
		foreach ( $terms as $term_key => $term_object ) {
			if ( $term_object->term_id == $primary_cat_id ) {
				// Return this as the primary term
				$term = $term_object;
				break;
			}
		}
	}

	// Return the term
	return $term;
}, 10, 3 );