__constructの落とし穴。parent::ClassName()で呼び出すとFatal Errorになる。

Constructor.php

<?php
class Mother
{
    public function __construct()
    {
        echo "I am Mother. \n";
    }
}

class Child extends Mother
{
    public function __construct()
    {
        parent::Mother();
        echo "I am Child. \n";
    }
}

$obj = new Child;