Add a custom class name to Wordpress body tag

Soution code for : Add a custom class name to Wordpress body tag

We can use the body_class filter, like so:

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function my_plugin_body_class($classes) {     $classes[] = 'foo';     return $classes; }   add_filter('body_class', 'my_plugin_body_class');

Although, obviously, our theme needs to call the corresponding body_class function.