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I have similar problem as described in How to trap "Publish" button to check for meta box validation? Answer there is to hook into save_post and change post type. How can I do it? I try to use wp_transition_post_status but it doesn't work for me...

function myHook( $post_ID, $post )

    wp_transition_post_status('pending', $post->post_status, $post );


add_action( 'save_post', 'myHook', 10, 2 );

Edit: I have clear wordpress installation without any plugins, additional code and similar

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Please add your relevant code. "Try" is very vague... – kaiser Jan 5 '13 at 18:21

You get the full post object as a second parameter on save_post. Use it to change the status just like the following code.

add_action( 'save_post', 'wpse_78351_status', 10, 2 );

function wpse_78351_status( $post_ID, $post )
    remove_filter( current_filter(), __FUNCTION__ );

    if ( 'trash' !== $post->post_status ) //adjust the condition
        $post->post_status = 'draft'; // use any post status
        wp_update_post( $post );

See this answer for a list of post statuses.

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Your code causes Fatal error: Maximum execution time of 30 seconds exceeded in /var/www/localhost/htdocs/wordpress1/wp-includes/kses.php on line 1023 – user1666774 Jan 5 '13 at 19:20
@SomeoneHere Indeed, sorry, fixed. See my update. :) – toscho Jan 5 '13 at 19:24
I also found another fix: add remove_action( 'save_post', 'myHook'); before wp_update_post( $post ); and add_action( 'save_post', 'myHook', 10, 2 ); after It works :) Thank you a lot for help :) – user1666774 Jan 5 '13 at 19:27

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