ob_get_level

For users confused about getting "1" as a return value from ob_get_level at the beginning of a script: this likely means the PHP ini directive "output_buffering" is not set to off / 0. PHP automatically starts output buffering for all your scripts if this directive is not off (which acts as if you called ob_start on the first line of your script).If your scripts may end up on any server and you don't want end-users to have to configure their INI, you can use the following at the start of your script to stop output buffering if it's already started:<?phpif (ob_get_level()) ob_end_clean();?>Alternatively, you can use the opposite if you always want to have an output buffer at the start of your script:<?phpif (!ob_get_level()) ob_start();?>

This can be used to handle exceptions properly when using output buffering for rendering a view which may or may not be using output buffering<?phpfunction getView($view){    $level = ob_get_level();     ob_start();     try    {        include $view;    }    catch (Exception $e)    {        while (ob_get_level() > $level)        {            ob_end_clean();        }        throw $e;    }    return ob_get_clean();}