Wordpress: trying to get posts by tag

Question

I\'ve written some code which automatically creates some posts and adds a tag to them. I can see the tags in the \'All posts\' admin panel and I can click on the posts \'Ta

Answer 1

Answer was found here - https://codex.wordpress.org/Template_Tags/get_posts

Following example displays posts tagged with 'jazz', under 'genre' custom taxonomy, using 'tax_query'

$args = array(
    'tax_query' => array(
        array(
            'taxonomy' => 'genre',
            'field' => 'slug',
            'terms' => 'jazz'
        )
    )
);
$postslist = get_posts( $args );

So for you it will be

$args = array( 
        'posts_per_page' => 5,
        'tax_query'      => array(
            array(
                'taxonomy'  => 'post_tag',
                'field'     => 'slug',
                'terms'     => sanitize_title( $brand_name )
            )
        )
    );

$postslist = get_posts( $args );