$data = array post_type = post post_status = publish orderby = date order = ASC posts_per_page = 8 ;i want get posts by category id 5

To retrieve posts by category ID 5, you can modify the $data array as follows:

$data = array(
    'post_type' => 'post',
    'post_status' => 'publish',
    'orderby' => 'date',
    'order'   => 'ASC',
    'posts_per_page' => '8',
    'cat' => 5,
);

By adding the 'cat' => 5 line, you specify that you want to retrieve posts from category ID 5.