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I need a way to disable the save process completely using an action/filter. Something that works (for e.g.:) in the query, posts_clauses or wp_insert_post/save_post/update_post hooks.

So far I only tried to return '';, which gives me tons of errors for missing values for post object parts in the admin UI.

This should happen "silently", so no errors get thrown when php_error/WP_DEBUG and such are set to TRUE/On.

Btw: I'm not asking for how to disable the autosave feature.

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1 Answer

up vote 3 down vote accepted 
function disable_save( $maybe_empty, $postarr ) {
    $maybe_empty = true;

    return $maybe_empty;
}
add_filter( 'wp_insert_post_empty_content', 'disable_save', 999999, 2 );

Because wp_insert_post_empty_content is set to true, WordPress thinks there is no title and no content and stops updating the post.

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3  
Or add_filter('wp_insert_post_empty_content', '__return_true'); – chrisguitarguy May 12 '12 at 21:46
I guess you haven't tried this? The problem is that I get tons of Notice: Undefined property: stdClass::$post_XY in R:\development\xampp\htdocs\wprepo\wp-admin\edit-form-advanced.php on line XY and Warning: Cannot modify header information - headers already sent by (output started at R:\development\xampp\htdocs\wprepo\wp-admin\post-new.php:46) in R:\development\xampp\htdocs\wprepo\wp-includes\functions.php on line 86X. It's exactly the same result as intercepting the query filter and returning ''/false/null. – kaiser May 13 '12 at 13:18
Ok, here's why I am wrong: I checked the 2nd argument inside the filter (see edit of your answer). There I checked if the post_status is draft/pending/auto-draft. The last one is a real problem maker, as on every page-new re-load an auto-draft gets added to the database (which will be cleaned up by wp automagically). If I disable the save process there, then the above mentioned errors jump in. @ChristopherDavis I don't really understand why it works without priority and argument number in your case. – kaiser May 13 '12 at 14:06

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