Open you theme’s functions.php file and add the below code or you can also add the below code if you are using any site-specific plugin.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | add_action('save_post', 'wpds_check_thumbnail'); add_action('admin_notices', 'wpds_thumbnail_error'); function wpds_check_thumbnail( $post_id ) { // change to any custom post type if( get_post_type($post_id) != 'post' ) return; if ( ! has_post_thumbnail( $post_id ) ) { // set a transient to show the users an admin message set_transient( "has_post_thumbnail", "no" ); // unhook this function so it doesn't loop infinitely remove_action('save_post', 'wpds_check_thumbnail'); // update the post set it to draft wp_update_post(array('ID' => $post_id, 'post_status' => 'draft')); add_action('save_post', 'wpds_check_thumbnail'); } else { delete_transient( "has_post_thumbnail" ); } } function wpds_thumbnail_error() { // check if the transient is set, and display the error message if ( get_transient( "has_post_thumbnail" ) == "no" ) { echo "<div id='message' class='error'><p><strong>You must add a Featured Image before publishing this. Don't panic, your post is saved.</strong></p></div>"; delete_transient( "has_post_thumbnail" ); } } |
That’s all, I hope this helped you!
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