how to delete all users and posts based on 'user_meta'? - wordpress

Question

I have developed a small wordpress application where It has Institutes(wp user), Trainers(wp user), Trainees(wp user), courses(custom post) and notifications(custom post). All the application is working fine but If I delete an institute all the information belongs to that institute like Trainers, Trainee, notifications & courses should also be deleted. While I was creating the 'institute' user I am storing the all the related info like first name, last name in wordpress table 'wp_users' and 'institute name' is storing as 'user meta' with key 'inistitute_name' in 'wp_usermeta' table like below is my code:
$user_data = array(
'ID' => '',
'user_pass' => '',
'user_login' => $first_name,
'user_email' => $user_email,
'first_name' => $first_name,
'last_name' => $last_name,
'role' => 'admin'//get_option('default_option')
);
$random_password = wp_generate_password(8,false);
$user_id = wp_insert_user( $user_data );
update_user_meta( $user_id, 'inistitute_name',$insititute_name );
While creating Trainer (or) Trainee my code is like below:
$user_data = array(
'ID' => '',
'user_pass' => '',
'user_login' => $first_name,
'user_email' => $trainer_email,
'first_name' => $first_name,
'last_name' => $last_name,
'role' => 'trainer'
);
$random_password = wp_generate_password(8,false);
$user_id = wp_insert_user( $user_data );
update_user_meta( $user_id, 'inistitute_name',$this->institute_name[0] );
wp_set_password($random_password, $user_id);
While creating courses my code is like below:
$user_ID = get_current_user_id();
$institute_name = get_user_meta($user_ID, 'inistitute_name', true);
$post = array(
'post_title' => $title,
'post_content' => $description,
'post_status' => 'publish',
'post_type' => "courses"
);
$id = wp_insert_post($post);
update_post_meta( $id, 'inistitute_name', $institute_name );
Suppose let us say if a institute 'abcd' is deleted then all the information like 'trainer', 'trainee', 'courses' & 'notifications' associated with that institute should also be deleted based on a 'user_meta' field. Is it possible to delete? (or) did I do any mistake? can anyone tell me what was I doing wrong?

Answer 1

Try this code:
$user_args = array(
'meta_key' => 'inistitute_name',
'meta_value' => 'your_value', //<-- replace it by your user_meta value.
'meta_compare' => '=',
'orderby' => 'ID',
'number' => -1
);
// Custom query.
$user_query = new WP_User_Query($user_args);
// Get query results.
$users = $user_query->get_results();
//print_r($users);
// Check for users
if (!empty($users))
{
// Loop over users.
foreach ($users as $user)
{
$user_id = $user->ID;
// Get each user's data.
$user_info = get_userdata($user->ID);
$user_display_name = $user_info->display_name;
$args = array(
'numberposts' => -1,
'post_type' => 'any', //<-- you can Specific type by array('post', 'my_custom_post')
'author' => $user_id
);
// get all posts by this user: posts, pages, attachments, etc..
$user_posts = get_posts($args);
if (!empty($user_posts))
{
// delete all the user posts
foreach ($user_posts as $user_post)
{
wp_delete_post($user_post->ID, true);
}
}
wp_delete_user( $user_id, $reassign );
}
}
else
{
//"no user found"
}
I haven't tested this code, out form my WP knowledge.
Please note before testing this code do take a Database backup.

Answer 2

I got the solution form wordpress.stackexchange.com link to that question is here
https://wordpress.stackexchange.com/questions/249435/how-to-delete-all-users-and-posts-based-on-user-meta/