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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2435 | if ( !empty($ID) ) { |
| 2436 | $update = true; |
| 2437 | $previous_status = get_post_field('post_status', $ID); |
| 2438 | } else { |
| 2439 | $previous_status = 'new'; |
| 2440 | } |
| 2441 | |
| 2442 | $maybe_empty = ! $post_content && ! $post_title && ! $post_excerpt && post_type_supports( $post_type, 'editor' ) |
| 2443 | && post_type_supports( $post_type, 'title' ) && post_type_supports( $post_type, 'excerpt' ); |
| 2444 | if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) { |
| 2445 | if ( $wp_error ) |
| 2446 | return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) ); |
| 2447 | else |
| 2448 | return 0; |
| 2449 | } |
| 2450 | |
| 2451 | if ( empty($post_type) ) |
| 2452 | $post_type = 'post'; |
| 2453 | |