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abstract class Shape
{
	// No attributes to declare
	// No constructor or destructor defined here
	
	// Method to calculate and return the area.
	abstract protected function getArea();
	
	// Method to calculate and return the perimeter.
	abstract protected function getPerimeter();
}
// End of Shape class.

Next I declared "Triangle" class

<?php
class Triangle extends Shape
{
	// Declare the attributes:
	private $_sides = array();
...

Then created the "abstract.php"

<!DOCTYPE html>

<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Triangle</title>
		<link href="css/style.css" rel="stylesheet">
	</head>
	
	<body>
	<?php
	# Script 6.3 - abstract.php
	// This page uses the Triangle class (Script 6.2), which is derived
	// from Shape (Script 6.1).
	
	// Load the class definitions
	require('Shape.php');
	require('Triangle.php');
	
	// Set the triangle's sides:
	$side1 = 5;
...

When I run abstract.php, it generates the following error

Fatal error: Class 'Shape' not found in C:~\Triangle.php on line 15

I don't understand why it's showing this error. Please help!

My PHP version is 5.6.12 using XAMPP Version 5.6.12

Edited by alex_r
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Am not sure what happened too. 

I tested using "include", which worked and later i used "require" and now seems to work fine no problem. I don't know what the problem is.

	// Load the class definitions
	/*
	include('Shape.php');
	include('Triangle.php');
	*/
	
	require('Shape.php');
	require('Triangle.php');
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