Force “Submit to review” when a post is updated

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It is possible to stop author to publish post, and force him to Submit For Preview. Just add this code to your functions.php and you are all done.

<?php
   function take_away_publish_permissions() {
        $user = get_role('author');
        $user->add_cap('publish_posts',false);
   }
   add_action('init', 'take_away_publish_permissions' );
?>

** Updated Code **
This code shared here is for setting post status to preview or pending whenever a author update a post.

function postPending($post_ID)
 { 
     if(get_role('author'))
     {
        //Unhook this function
        remove_action('post_updated', 'postPending', 10, 3);

        return wp_update_post(array('ID' => $post_ID, 'post_status' => 'pending'));

        // re-hook this function
        add_action( 'post_updated', 'postPending', 10, 3 );
     }
 }
add_action('post_updated', 'postPending', 10, 3);

NOTE: If you are calling a function such as wp_update_post that
includes the save_post hook, your hooked function will create an infinite loop. To avoid this, unhook your function before calling the
function you need, then re-hook it afterward. For details look into this link

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