Passing Objects into PHP constructor error

Question

Is it possible to pass an object into the constructor of a PHP class, and set that object as a global variable that can be used by the rest of the functions in the class?

For example:

class test {

   function __construct($arg1, $arg2, $arg3) {
      global $DB, $ode, $sel;

      $DB = arg1;
      $ode = arg2;
      $sel = $arg3;
   }

   function query(){
      $DB->query(...);
   }

}

When I try to do this, I get a "Call to a member function on a non-object" error. Is there anyway to do this? Otherwise, I have to pass the objects into each individual function directly.

Thanks!

Answer 1

You probably want to assign them to values on $this.

In your constructor, you'd do:

$this->DB = $arg1;

Then in your query function:

$this->DB->query(...);

This should similarly be done with the other arguments to your constructor.

$this in an instance context is how you reference the current instance. There's also keywords parent:: and self:: to access members of the superclass and static members of the class, respectively.