How to access service container in symfony2 global helper function (service)?

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I assume that the first error (undefined property) happened before you added the property and the constructor. Then you got the second error. This other error means that your constructor expects to receive a Container object but it received nothing. This is because when you defined your service, you did not tell the Dependency Injection manager that you wanted to get the container. Change your service definition to this:

services:
  biztv.helper.globalHelper:
    class: BizTV\CommonBundle\Helper\globalHelper
    arguments: ['@service_container']

The constructor should then expect an object of type Symfony\Component\DependencyInjection\ContainerInterface; 

use Symfony\Component\DependencyInjection\ContainerInterface as Container;

class globalHelper {    

    private $container;

    public function __construct(Container $container) {
        $this->container = $container;
    }

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