Custom function for specific user role

Question

I need to run some functions/filters for specific user roles. This code filters the admin order page (Woocommerce) to only show orders that are in GBP.

add_filter('request', function($vars) {
global $typenow, $wpdb;

// Add logic to determine if the orders list should be filtered, and which
// currency
$currency = 'GBP';

if($typenow == 'shop_order') {
$vars['meta_query']['relation'] = 'AND';
// Only show orders in the specific currency
$vars['meta_query'] = array(
    array(
        'key' => '_order_currency',
        'value' => $currency,
        'compare' => '=',
        ),
    );
}
return $vars;
}, 15 );

This works as expected. What I need to do is make this code only run for certain roles. The role I need to fire it on is uk_staff. I then need to create the same thing except for $currency = 'AUD'; and the role au_staff.

Can anyone give me some help making this function only fire for certain roles?

Answer 1

The core has functions like current_user_can to check for an capability of a role or check the role directly. The follow example extend your source for this check so that the function not (!) run, if the current user haven't the rights, the capability of his role.

add_filter('request', function( $vars ) {

// Check the capability of the current user.
if ( ! current_user_can( 'manage_options' ) )
    return;

global $typenow, $wpdb;

// Add logic to determine if the orders list should be filtered, and which
// currency
$currency = 'GBP';

if($typenow == 'shop_order') {
$vars['meta_query']['relation'] = 'AND';
// Only show orders in the specific currency
$vars['meta_query'] = array(
    array(
        'key'     => '_order_currency',
        'value'   => $currency,
        'compare' => '=',
        ),
    );
}
return $vars;
}, 15 );