wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php:378Creates autosave for the specified post.
$post_dataarray$metaarrayoptionalarray()mixedOne hook fires while WP_REST_Autosaves_Controller::create_post_autosave() runs, in this order:
Fires before an autosave is stored.
public function create_post_autosave( $post_data, array $meta = array() ) { $post_id = (int) $post_data['ID']; $post = get_post( $post_id ); if ( is_wp_error( $post ) ) { return $post; } // Only create an autosave when it is different from the saved post. $autosave_is_different = false; $new_autosave = _wp_post_revision_data( $post_data, true ); foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields( $post ) ) ) as $field ) { if ( normalize_whitespace( $new_autosave[ $field ] ) !== normalize_whitespace( $post->$field ) ) { $autosave_is_different = true; break; } } // Check if meta values have changed. if ( ! empty( $meta ) ) { $revisioned_meta_keys = wp_post_revision_meta_keys( $post->post_type ); foreach ( $revisioned_meta_keys as $meta_key ) { // get_metadata_raw is used to avoid retrieving the default value. $old_meta = get_metadata_raw( 'post', $post_id, $meta_key, true ); $new_meta = $meta[ $meta_key ] ?? ''; if ( $new_meta !== $old_meta ) { $autosave_is_different = true; break; } } } $user_id = get_current_user_id(); // Store one autosave per author. If there is already an autosave, overwrite it. $old_autosave = wp_get_post_autosave( $post_id, $user_id ); if ( ! $autosave_is_different && $old_autosave ) { // Nothing to save, return the existing autosave. return $old_autosave->ID; } if ( $old_autosave ) { $new_autosave['ID'] = $old_autosave->ID; $new_autosave['post_author'] = $user_id; /** This action is documented in wp-admin/includes/post.php */ do_action( 'wp_creating_autosave', $new_autosave, true ); // wp_update_post() expects escaped array. $revision_id = wp_update_post( wp_slash( $new_autosave ) ); } else { // Create the new autosave as a special post revision. $revision_id = _wp_put_post_revision( $post_data, true ); } if ( is_wp_error( $revision_id ) || 0 === $revision_id ) { return $revision_id; } // Attached any passed meta values that have revisions enabled. if ( ! empty( $meta ) ) { foreach ( $revisioned_meta_keys as $meta_key ) { if ( isset( $meta[ $meta_key ] ) ) { update_metadata( 'post', $revision_id, $meta_key, wp_slash( $meta[ $meta_key ] ) ); } } } return $revision_id; }Introduced in 5.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.