add_cssclass: add conditional return type

[IanDelMar]

add_cssclass():

 * @param string $class_to_add The CSS class to add.
 * @param string $classes      The string to add the CSS class to.
 * @return string The string with the CSS class added.
 */
function add_cssclass( $class_to_add, $classes ) {
	if ( empty( $classes ) ) {
		return $class_to_add;
	}

	return $classes . ' ' . $class_to_add;
}

Whenever $classes is an empty string $class_to_add is returned as is (template T). If $classes is not empty, $class_to_add is appended and returned. We therefore know, it's a non-empty-string. Further refinement would required a more complex conditional return type. The returned type depends on $classes (conditional type).

oracle-inspired

[szepeviktor]

oracle-inspired

👁️