How can i list random post from multiple category?

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I have an author page, and I want to list posts from current author’s categories.

e.g. I’m viewing John’s page, and John wrote in Sport, Tech, News, Computer categories.

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Then my code list from this (Sport, Tech, News, Computer) categories list random 10 post.

But something is going wrong:

Those 4 categories have 25 posts. But my code isn’t listing 10 posts, it’s just listing 1 post. And i need random post list

My code: 

<?php global $post, $wpdb;
$author_id = $post->post_author;
$categories = $wpdb->get_results("
    SELECT DISTINCT(terms.term_id) as ID, terms.name, terms.slug
    FROM $wpdb->posts as posts
    LEFT JOIN $wpdb->term_relationships as relationships ON posts.ID = relationships.object_ID
    LEFT JOIN $wpdb->term_taxonomy as tax ON relationships.term_taxonomy_id = tax.term_taxonomy_id
    LEFT JOIN $wpdb->terms as terms ON tax.term_id = terms.term_id
    WHERE 1=1 AND (
        posts.post_status = 'publish' AND
        posts.post_author = '$author_id' AND
        tax.taxonomy = 'category' )
    ORDER BY terms.name ASC
");

foreach($categories as $category) : 
    $catnumber = $category->ID.',';
endforeach;?>
<?php 

$args = array(
'category__and' => array( $catnumber )
, 'showposts'=> '10'
);

$my_query = new WP_Query( $args );
?>
<ul>
<?php while ( $my_query->have_posts() ) : $my_query->the_post(); ?>
    <li>
        <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>  
    </li>
<?php endwhile; ?>
<ul>
<?php wp_reset_postdata(); ?>
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1 comment

  1. Granted, I may be misinterpreting you. Your post is not very clear but …

    category__and will require the posts to be in both categories. It sounds like you need posts in any of the categories. You should be using category__in so that you get an OR match on the categories instead of an AND match.

    showposts is deprecated.

    Both category__and and category__in accept an array. You are building a comma separated string of categories and then casting it as an array. That is not likely to work as expected.

    Build your category array like this:

    foreach($categories as $category) : 
    $catnumber[] = $category->ID;
endforeach;

    And query like this:

    $args = array(
    'category__in'    => $catnumber,
    'posts_per_page'  => 10,
    'orderby'         => 'rand'
);

    http://codex.wordpress.org/Class_Reference/WP_Query#Category_Parameters