<?php
class A {
    function __construct()
    {
        $this->build();
    }

    function build()
    {
        echo "buildA";
    }
}

class B extends A {
    function __construct()
    {
        parent::construct();
        $this->build();
    }

    function build()
    {
        echo "buildB";
    }
}

new B();
?>