使用构造函数初始化变量的正确方法

Question

Is this the correct way of initializing the variables using constructor?

class Customer
{
    public $custId;
    public $custName;
    function _construct()
    {
        $this->custId   = 'Eazy01';
        $this->custName = 'EazyLearnKaloor';
    }

    function DisplayDetails()
    {
        echo "$custId<br>";
        echo "$custName";
    }
}

$obj = new Customer();
$obj->DisplayDetails();

Answer 1

You need to use double undersores as in __construct().

class Customer
{
    public $custId;
    public $custName;
    function __construct()
    {
        $this->custId   = 'Eazy01';
        $this->custName = 'EazyLearnKaloor';
    }

    function DisplayDetails()
    {
        echo "$this->custId<br>"; // use $this here
        echo "$this->custName"; // use $this here
    }
}

$obj = new Customer();
$obj->DisplayDetails();

Also you could pass variables to constructor:

    function __construct($id, $name)
    {
        $this->custId   = $id;
        $this->custName = $name;
    }

Then when initialising new class you can do:

$var = new Customer('Eeazy01', 'EazyLearnKaloor');