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WordPress has this nifty little “body_class()” function that I use every now and then to add css classes to the html “body” tag.

Today I wanted to add the current user’s id to the class, and here’s how I did it:

// Add user id CSS class via http://codex.wordpress.org/Function_Reference/body_class
add_filter( 'body_class', 'my_class_names' );
function my_class_names( $classes ) {
	// add 'class-name' to the $classes array
	global $current_user;
	$user_ID = $current_user->ID;
	$classes[] = 'user-id-' . $user_ID;
	// return the $classes array
	return $classes;
}

If a user is not logged in, they get the “user-id-0” class.

Pretty neat, eh?

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