如何在类中访问具有随机值的变量？

   class Session{
        protected $git =  md5(rand(1,6)); 
        public function __construct($config = array())
        {
           //// some code
            $ses_id = $this->git;

        }
        public function _start_session()
        {
           //code again..
        }
      }

Here I can't assign a random value like this to variable called git. How can I do this if it is possible? That random value need to be first time generated value only till the time it converts to Null.

Perform random inside your constructor,

class Session{
        protected $git; 
        public function __construct($config = array())
        {
           //// some code
           $this->git =  md5(rand(1,6));
           $ses_id = $this->git;

        }
        public function _start_session()
        {
           //code again..
        }
      }

Declare a variable inside a class,initialize the variables in class inside a constructor, which sets the variables once the object for that class is declared anywhere in the code.

I updated this answer if you want to do not change your session variable on each constructor call then use the below procedure.

class Session{
       protected $git;
        public function __construct($config = array())
        {
           $this->git  =  md5(rand(1,6)); 
           if(!isset($_SESSION['ses_id']))
            {
            $_SESSION['ses_id'] = $this->git;
            }
        }
        public function _start_session()
        {
           //code again..
        }
      }

I hope this helps you.

Try setting the value of your variable in your constructor.

constructor will run every time you create an instance of your class.

try this code:

      class Session{
        protected $git;
        public function __construct($config = array())
        {
           //// some code
           $this->git = md5(rand(1,6));
        }
        public function _start_session()
        {
           //code again..
        }
      }

:)

Try this using a global variable to track the random number:

class Session{
    protected $git;
    public function __construct($config = array())
    {
        //// some code
        if (!isset($GLOBALS['random_val'])) {
            $GLOBALS['random_val'] = md5(rand(1,6));
        }

        $this->git = $GLOBALS['random_val'];
        $ses_id = $this->git;
        var_dump("Session ID: ".$ses_id);

    }

    public function _start_session()
    {
        //code again..
    }
}


$ses1 = new Session(); // Outputs string(44) "Session ID: 1679091c5a880faf6fb5e6087eb1b2dc"
$ses2 = new Session(); // Outputs string(44) "Session ID: 1679091c5a880faf6fb5e6087eb1b2dc"