WordPress Version: 6.2
/**
* Displays the classes for the post container element.
*
* @since 2.7.0
*
* @param string|string[] $css_class Optional. One or more classes to add to the class list.
* Default empty.
* @param int|WP_Post $post Optional. Post ID or post object. Defaults to the global `$post`.
*/
function post_class($css_class = '', $post = null)
{
// Separates classes with a single space, collates classes for post DIV.
echo 'class="' . esc_attr(implode(' ', get_post_class($css_class, $post))) . '"';
}