function searchForName($name, $array) {
foreach ($array as $key => $val) {
if ($val['nickname'] === $name) {
return true;
}
}
return null;
}
$current_user = wp_get_current_user();
if(searchForName($current_user->user_login,get_field('YourACFUserField'))):
//CODE GOES HERE
endif;
something like that
