Get 1 post from each cat WP

<?php
        $cat_args = array(
          'orderby' => 'name',
          'order' => 'ASC',
          'child_of' => 0
        );
        $categories=get_categories($cat_args);
        $rand_keys = array_rand($categories, 5); // 5 is the number of categories you want
        foreach ($rand_keys as $key) {

            $post_args = array(
              'numberposts' => 1,
              'category' => $categories[$key]->term_id
            );

            $posts = get_posts($post_args);

            foreach($posts as $post) {
            ?>

            content here....


            <?php
            }

        }
?>