wp_insert_post hook for a wordpress plugin

Question

I'm trying to make a wordpress plugin to auto-translate posts just before it's inserted, it's for a specific need where I want to write in a language, post in a different one, so far, I'm not able to hook the wp_insert_post, or I don't understand how to do this properly,

I posted my hook code here, I note it's my very first plugin, I appreciate any help or helpful remarks.

Mike,

function tr_insert_post($post, $wp_error = false)
{

    $post ['post_title'] = "the title: ".$post ['post_title'];

    return $post;
}


add_action('wp_insert_post', 'tr_insert_post',1,2); 

Answer 1

The right hook to use before inserting the post is wp_insert_post_data

function tr_insert_post($data){
    $post ['post_title'] = "the title: ".$post ['post_title'];
    return $post;
}

add_action('wp_insert_post_data', 'tr_insert_post',1,2); 

But I think that a better way to achieve that would be to save the post as is and translate later using a filter like the_content this way you save the post in the same language as you posted and you can edit it easily in that same language.