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Why is this still 2 after using the constructor?

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2016-10-19 10:18:50941browse

Why is the result 2 instead of 5? 

<code>class a{
    public $age=2;
    public function __constrator(){
       $this->age=$age+3;
    }
    
}

$k=new a();
echo $k->age;</code>
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