Disable gateways for specific events

<?php
/*
This snippet disables the paypal gateway for events with event ID 123 and 321. You can modify the events to exclude and gateways to exclude in $events_to_exclude and $gateways_to_exclude respectively.

This only works if your booking forms are showing on the specific event page, rather than via a shortcode or similar on another page.

For information on implementing this snippet see this - http://wp-events-plugin.com/tutorials/how-to-safely-add-php-code-to-wordpress/
*/
function my_emp_disable_gateway($return){
    global $EM_Event;
    $events_to_exclude = array(123,321); //event ids you want excluding the following gateways
    $gateways_to_exclude = array('paypal'); //gateways you want excluded for the events above
    if( in_array($EM_Event->event_id, $events_to_exclude) ){
        foreach($gateways_to_exclude as $gateway){ //loop through active gateways
            unset($return[$gateway]); //removes gateway from the active gateways array
        }
    }
    return $return;
}
add_filter('option_em_payment_gateways','my_emp_disable_gateway', 10, 1);