将参数传递给PHP中的父类构造函数？

Question

I have 2 classes where parent is inherited by child.

class parentClass
{
    private $table_name='';

    public function __construct($argument)
    {
        $this->table_name=$argument;
        echo $this->table_name;
    }
}

class child extends parentClass
{
    private $table="student";

    public function __construct()
    {
        parent::__construct($this->table);
    }
}

There is some thing like this below that has to be used but I am unable to understand how and why.

$args = func_get_args();
call_user_func_array(array($this, 'parent::__construct'), $args);

Help me as

What should be the correct code to achieve the correct logic and please support it with a reference to gain a better understanding.

Answer 1

Not a direct answer, but if I read the code correctly, you don't really want to pass a variable / value to the constructor. Instead you want to pass a fixed class property like a table name.

In that case you could use a constant in the child class and set that in the parent's constructor. The child class would not need a separate constructor if that is all you want to do.

So something like :

class parentClass
{
   private $table_name;

   function __construct() {
       $this->table_name = static::TABLE;
       echo $this->table_name;
   }
}

class childClass extends parentClass
{
    const TABLE = "student";
}

$obj = new childClass();