A constructor is a special functions which are automatically called when an object is created . The constructor is the most useful , especially because it allows you to send parameters along when creating a new object, which can then be used to initialize variables on the object. Constructor is nothing but a function defined in your PHP class. Constructor function automatically called when you will create object of the class. As soon as you will write $object = new yourClass() your constructor function of the class will be executed. you can create constructor by defining magic function __construct.
Example:
class MyClass
{
public $var;
// Class constructor
public function __construct($var)
{
echo 'Created an object of MyClass';
$this->var = $var;
}
}
// Make an object
$objA = new MyClass('A');
// Call an object method to show the object’s property
If you have created parameter in the constructor you need to pass value for them on the time of object creation.
$objCls = new MyClass(‘A’). If you will not send value PHP will throw error.
Read more OOP in PHP
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