Talking about the dependency of the PHP object

Methods of constructing functions

1<?PHP2 //defines a class in which the following classes rely on methods within this class3 classPlay4 {5      Public functionplaying ()6     {7         Echo"I can playing";8     }9 }Ten  One classVideo A { -     Private $action;//Defining private Properties -      Public function__construct ($a)//to make an object argument the     { -         return $this->action =$a; -     } -     //accessing private properties in a class by method +      Public functiongetaction () -     { +         $this->action->playing (); A     } at } -  - $ply=Newplay (); - $vid=NewVideo$ply); - $vid->getaction ();//output I can playing

By property

<?PHP//defines a class in which the following classes rely on methods within this classclassplay{ Public functionplaying () {Echo"I can playing"; }}classvideo{Private $action;//Defining private Properties     Public function__set ($param,$a)//setting property values by the __set () method    {        return $this->action =$a; }    //accessing private properties in a class by method     Public functiongetaction () {return $this->action->playing (); }}$ply=NewPlay ();//instantiate the play class behind the parameters$vid=Newvideo ();$vid->action =$ply;//The __set () method is called when accessing video as a defined property value (you can see the Magic Method of PHP)$vid->getaction ();//output I can playing

Talking about the dependency of the PHP object