Restrict authors to display only their posts on WordPress

Sometimes it can be very useful to make sure that on the wordpress board authors see only and exclusively their articles. Do this only if you are able to make a backup, to restore it without problems and if you know what you are doing. In the function.php file of your theme you have to add the following code (of course, the display will not be restricted for administrators):

function posts_for_current_author($query) {
global $pagenow;
if( 'edit.php' != $pagenow || !$query->is_admin )
return $query;
if( !current_user_can( 'edit_others_posts' ) ) {
global $user_ID;
$query->set('author', $user_ID );
}
return $query;
}
add_filter('pre_get_posts', 'posts_for_current_author');