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<?php
/**
* Dynamically Populating User Role
* http://gravitywiz.com/2012/04/30/dynamically-populating-user-role/
*/
add_filter('gform_field_value_user_role', 'gform_populate_user_role');
function gform_populate_user_role($value){
    $user = wp_get_current_user();
    $role = $user->roles;
    return reset($role);
}