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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 |
|---|---|
| 376 | wp_delete_post_revision( $old_autosave->ID ); |
| 377 | return new WP_Error( |
| 378 | 'rest_autosave_no_changes', |
| 379 | __( 'There is nothing to save. The autosave and the post content are the same.' ), |
| 380 | array( 'status' => 400 ) |
| 381 | ); |
| 382 | } |
| 383 | |
| 384 | /** This filter is documented in wp-admin/post.php */ |
| 385 | do_action( 'wp_creating_autosave', $new_autosave ); |
| 386 | |
| 387 | // wp_update_post() expects escaped array. |
| 388 | return wp_update_post( wp_slash( $new_autosave ) ); |
| 389 | } |
| 390 | |
| 391 | // Create the new autosave as a special post revision. |
| 392 | return _wp_put_post_revision( $post_data, true ); |
| 393 | } |
| 394 | |