Fixed Backorder instead of On backorder with Woo Commerce fetch availability

gistfile1.txt

	add_filter( 'wp_schema_pro_schema_product', 'my_extra_schema_field_mapping', 10, 3 );


/**
 * Mapping extra field for schema markup.
 *
 * @param  array $schema Schema array.
 * @param  array $data   Mapping fields array.
 * @return array
 */
function my_extra_schema_field_mapping( $schema, $data, $post ) {

	if ( isset( $data['avail'] ) && ! empty( $data['avail'] ) ) {
		if('onbackorder' === $data['avail']) {
		$schema['offers']['availability']  = "BackOrder";
		}
		
	}
	return $schema;
}