add_action( 'pre_get_posts', 'callback_function_name' );
function callback_function_name( $query ) {}
// for PHP 5.3.0 or above
add_action( 'pre_get_posts', function( $query ){} );
ParameterDetails$query(WP_Query) Loop object
If you are using PHP 5.3.0 or above, you can use closures (an...
