portfolio function

//The PHP WordPress Filter, added in function.php

function filter_products() {
    $catIds = $_POST['catIds'];
    $tagIds = $_POST['tagIds'];

    $args = [
        'post_type' => 'post',
        'posts_per_page' => -1,
        'post_status'  => 'publish',
        'orderby'        => 'date',
        'order'          => 'desc',
    ];
    // project Category
    if (count($catIds) > 1) {
        $args['tax_query'][] = [
            'taxonomy'      => 'category',
            'field'         => 'term_id',
            'terms'         => $catIds,
            'operator'      => 'IN'
        ];
    }
    // project tag
    if (count($tagIds) > 1) {
        $args['tax_query'][] = [
            'taxonomy'      => 'post_tag',
            'field'         => 'term_id',
            'terms'         => $tagIds,
            'operator'      => 'IN'
        ];
    }
    $ajaxproducts = new WP_Query($args);
    $response = '';
    if ( $ajaxproducts->have_posts() ) {
        ob_start();
        while ( $ajaxproducts->have_posts() ) : $ajaxproducts->the_post();
            $response .= '<li>'.the_title().'</li>';
        endwhile;
        $output = ob_get_contents();
        ob_end_clean();
    } else {
        echo __( 'No projects found' );
    }

    $result = [
        'total' => $counter,
        'html' => $output,
    ];

    echo json_encode($result);
    wp_reset_postdata();
    exit;
}
add_action('wp_ajax_filter_products', 'filter_products');
add_action('wp_ajax_nopriv_filter_products', 'filter_products');