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I know there are a lot of hooks in WP for altering a posts content (and other fields) before the post is written to the DB upon saving; but what I am interested in doing is running my custom filter before the post is loaded for editing. So basically when my custom post type is loaded by /wp-admin/post.php?post=##&action=edit, I would like to run my filter on it before the content is displayed in the WYSIWYG editor. Is that possible or no?

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up vote 3 down vote accepted

You can use the the_editor_content filter:

function wpa_editor_content( $content ) {
    global $post;
    return "this post's id is $post->ID " . $content;
add_filter( 'the_editor_content', 'wpa_editor_content' );
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