How to use an object inside an class member function in PHP

Question

I want to know how we could use a whole object inside an another object without using inheritance(if it is possible). if not how could we use PDO class with MySQL Database inherit with a class named abc having a default constructor. how could i use it manage to use PDO constructor value and abc constructor value at the same time?

here are the two objects

 <?php $pdo=new PDO('mysql:dbname=database;host=localhost','root','pwd'); class abc { var $a, $b; function __construct($parm1, $pram2) { $this->a=$parm1; $this->b=$parm2; } } ?> 

Answer 1

In PHP an object and a class are essentially the same thing. The __construct function is called when you create a new class object and you can pass arguments into the function at that time like so:

class abc {
    function __construct($dsn, $user, $password) {
        $this->pdo = new PDO($dsn, $user, $password);
    }
}

$my_class = new abc('mysql:dbname=database;host=localhost','root','pwd');

But I would do something like this to keep it simple:

class abc {
    function __construct() {
        $this->pdo = new PDO('mysql:dbname=database;host=localhost','root','pwd');
    }
}

$my_class = new abc();