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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 |
|---|---|
| 349 | |
| 350 | if ( ! $autosave_is_different ) { |
| 351 | wp_delete_post_revision( $old_autosave->ID ); |
| 352 | return new WP_Error( 'rest_autosave_no_changes', __( 'There is nothing to save. The autosave and the post content are the same.' ), array( 'status' => 400 ) ); |
| 353 | } |
| 354 | |
| 355 | /** |
| 356 | * This filter is documented in wp-admin/post.php. |
| 357 | */ |
| 358 | do_action( 'wp_creating_autosave', $new_autosave ); |
| 359 | |
| 360 | // wp_update_post expects escaped array. |
| 361 | return wp_update_post( wp_slash( $new_autosave ) ); |
| 362 | } |
| 363 | |
| 364 | // Create the new autosave as a special post revision. |
| 365 | return _wp_put_post_revision( $post_data, true ); |
| 366 | } |
| 367 | |