Call to a member function get() on null “Symfony Php”





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I'am trying to get details of devices who access our application. I have integrated "MobileDetectBundle" bundle in php symfony 3.4 version and followed the steps provided in the documentation. But I am getting the following error at this line 



$mobileDetector = $this->get('mobile_detect.mobile_detector');


Code Snippet :



$mobileDetector = $this->get('mobile_detect.mobile_detector');

$mobileDetector->isMobile();

$mobileDetector->isTablet();


Error :



"Call to a member function get() on null"


Please help me to solve this issue.






php symfony device-detection







share|improve this question































    1















    I'am trying to get details of devices who access our application. I have integrated "MobileDetectBundle" bundle in php symfony 3.4 version and followed the steps provided in the documentation. But I am getting the following error at this line 



    $mobileDetector = $this->get('mobile_detect.mobile_detector');


    Code Snippet :



    $mobileDetector = $this->get('mobile_detect.mobile_detector');
    
$mobileDetector->isMobile();
    
$mobileDetector->isTablet();


    Error :



    "Call to a member function get() on null"


    Please help me to solve this issue.






    php symfony device-detection







    share|improve this question



























      1












      1








      1


      0






      I'am trying to get details of devices who access our application. I have integrated "MobileDetectBundle" bundle in php symfony 3.4 version and followed the steps provided in the documentation. But I am getting the following error at this line 



      $mobileDetector = $this->get('mobile_detect.mobile_detector');


      Code Snippet :



      $mobileDetector = $this->get('mobile_detect.mobile_detector');
      
$mobileDetector->isMobile();
      
$mobileDetector->isTablet();


      Error :



      "Call to a member function get() on null"


      Please help me to solve this issue.






      php symfony device-detection







      share|improve this question
















      I'am trying to get details of devices who access our application. I have integrated "MobileDetectBundle" bundle in php symfony 3.4 version and followed the steps provided in the documentation. But I am getting the following error at this line 



      $mobileDetector = $this->get('mobile_detect.mobile_detector');


      Code Snippet :



      $mobileDetector = $this->get('mobile_detect.mobile_detector');
      
$mobileDetector->isMobile();
      
$mobileDetector->isTablet();


      Error :



      "Call to a member function get() on null"


      Please help me to solve this issue.






      php symfony device-detection




      php symfony device-detection






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 30 '18 at 8:14









      Trix

      10.3k85275




      10.3k85275










      asked Nov 24 '18 at 7:22









      Kiran KumarKiran Kumar

      4619




      4619
























          1 Answer
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          1














          The problem is with $this which assumed to be an instance of your controller class, but is null which means you are calling that somewhere (maybe inside controller constructor) where there is no $this yet.



          the solution indeed is Dependency Injection. you would better inject that service into your controller (which is defined as a service automatically through auto-wiring) and use it inside your controller:



          class MyController
          
{
          
    // ...
          

          
    protected $mobileDetector;
          

          
    public function __construct(MobileDetector $mobileDetector)
          
    {
          
        $this->mobileDetector = $mobileDetector;
          
        $this->mobileDetector->isMobile();
          
        $this->mobileDetector->isTablet();
          
    }
          

          
    // ...
          
}





          share|improve this answer
























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            The problem is with $this which assumed to be an instance of your controller class, but is null which means you are calling that somewhere (maybe inside controller constructor) where there is no $this yet.



            the solution indeed is Dependency Injection. you would better inject that service into your controller (which is defined as a service automatically through auto-wiring) and use it inside your controller:



            class MyController
            
{
            
    // ...
            

            
    protected $mobileDetector;
            

            
    public function __construct(MobileDetector $mobileDetector)
            
    {
            
        $this->mobileDetector = $mobileDetector;
            
        $this->mobileDetector->isMobile();
            
        $this->mobileDetector->isTablet();
            
    }
            

            
    // ...
            
}





            share|improve this answer




























              1














              The problem is with $this which assumed to be an instance of your controller class, but is null which means you are calling that somewhere (maybe inside controller constructor) where there is no $this yet.



              the solution indeed is Dependency Injection. you would better inject that service into your controller (which is defined as a service automatically through auto-wiring) and use it inside your controller:



              class MyController
              
{
              
    // ...
              

              
    protected $mobileDetector;
              

              
    public function __construct(MobileDetector $mobileDetector)
              
    {
              
        $this->mobileDetector = $mobileDetector;
              
        $this->mobileDetector->isMobile();
              
        $this->mobileDetector->isTablet();
              
    }
              

              
    // ...
              
}





              share|improve this answer


























                1












                1








                1







                The problem is with $this which assumed to be an instance of your controller class, but is null which means you are calling that somewhere (maybe inside controller constructor) where there is no $this yet.



                the solution indeed is Dependency Injection. you would better inject that service into your controller (which is defined as a service automatically through auto-wiring) and use it inside your controller:



                class MyController
                
{
                
    // ...
                

                
    protected $mobileDetector;
                

                
    public function __construct(MobileDetector $mobileDetector)
                
    {
                
        $this->mobileDetector = $mobileDetector;
                
        $this->mobileDetector->isMobile();
                
        $this->mobileDetector->isTablet();
                
    }
                

                
    // ...
                
}





                share|improve this answer













                The problem is with $this which assumed to be an instance of your controller class, but is null which means you are calling that somewhere (maybe inside controller constructor) where there is no $this yet.



                the solution indeed is Dependency Injection. you would better inject that service into your controller (which is defined as a service automatically through auto-wiring) and use it inside your controller:



                class MyController
                
{
                
    // ...
                

                
    protected $mobileDetector;
                

                
    public function __construct(MobileDetector $mobileDetector)
                
    {
                
        $this->mobileDetector = $mobileDetector;
                
        $this->mobileDetector->isMobile();
                
        $this->mobileDetector->isTablet();
                
    }
                

                
    // ...
                
}






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 30 '18 at 8:13









                TrixTrix

                10.3k85275




                10.3k85275
































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