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Why use constructor in PHP

When we want to give common functionality to the Object during creation of the Object then this functionality must be written into the constructor.


class interestCalculator{

     public $rate;
     public $duration;
     public $capital;

     public function __construct($rate, $duration,$capital) {
            echo $SI;
$obj=new interestCalculator(3.2,7,2800);

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