Add class to wordpress body_class() function

I recently needed to add a unique class to the body class for various templates.  I didn't want to write a function that cluttered the global namespace, so I wrote this function that uses create_function.

in your functions.php file add

function foo_add_body_class( $class_to_add = '' ) {	
	add_filter( 'body_class', create_function('$classes', 'return array_merge( $classes, array('.$class_to_add.') );' ) );
}

Then, in your template file all you need to do is add this one line of code before your get_heade() call.

foo_add_body_class( 'class-to-add' );

The function is limited to only one classname, but could be modified accept an array.