wp_autosave_post_revisioned_meta_fields( array $new_autosave )

Source

function wp_autosave_post_revisioned_meta_fields( $new_autosave ) {	/* * The post data arrives as either $_POST['data']['wp_autosave'] or the $_POST * itself. This sets $posted_data to the correct variable. * * Ignoring sanitization to avoid altering meta. Ignoring the nonce check because * this is hooked on inner core hooks where a valid nonce was already checked. */	$posted_data = isset( $_POST['data']['wp_autosave'] ) ? $_POST['data']['wp_autosave'] : $_POST;	$post_type = get_post_type( $new_autosave['post_parent'] );	/* * Go through the revisioned meta keys and save them as part of the autosave, * if the meta key is part of the posted data, the meta value is not blank, * and the meta value has changes from the last autosaved value. */	foreach ( wp_post_revision_meta_keys( $post_type ) as $meta_key ) {	if ( isset( $posted_data[ $meta_key ] )	&& get_post_meta( $new_autosave['ID'], $meta_key, true ) !== wp_unslash( $posted_data[ $meta_key ] )	) {	/* * Use the underlying delete_metadata() and add_metadata() functions * vs delete_post_meta() and add_post_meta() to make sure we're working * with the actual revision meta. */	delete_metadata( 'post', $new_autosave['ID'], $meta_key );	// One last check to ensure meta value is not empty.	if ( ! empty( $posted_data[ $meta_key ] ) ) {	// Add the revisions meta data to the autosave.	add_metadata( 'post', $new_autosave['ID'], $meta_key, $posted_data[ $meta_key ] );	}	}	} } 

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