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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 |
|---|---|
| 3283 | * Returning a truthy value to the filter will effectively short-circuit |
| 3284 | * the new post being inserted, returning 0. If $wp_error is true, a WP_Error |
| 3285 | * will be returned instead. |
| 3286 | * |
| 3287 | * @since 3.3.0 |
| 3288 | * |
| 3289 | * @param bool $maybe_empty Whether the post should be considered "empty". |
| 3290 | * @param array $postarr Array of post data. |
| 3291 | */ |
| 3292 | if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) { |
| 3293 | if ( $wp_error ) { |
| 3294 | return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) ); |
| 3295 | } else { |
| 3296 | return 0; |
| 3297 | } |
| 3298 | } |
| 3299 | |
| 3300 | $post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status']; |
| 3301 | if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash', 'auto-draft' ), true ) ) { |