Required Config

A setup file can load values that the main script expects before doing work.

require_config.php

<?php
$subtotal = ;
include __DIR__ . "/price_config.inc";
$tax = $subtotal * $taxRate;
$total = $subtotal + $tax;

echo "subtotal=" . $subtotal . "\n";
echo "tax=" . $tax . "\n";
echo "total=" . $total . "\n";

<?php
$subtotal = ;
include __DIR__ . "/price_config.inc";
$tax = $subtotal * $taxRate;
$total = $subtotal + $tax;

echo "subtotal=" . $subtotal . "\n";
echo "tax=" . $tax . "\n";
echo "total=" . $total . "\n";

<?php
$subtotal = ;
include __DIR__ . "/price_config.inc";
$tax = $subtotal * $taxRate;
$total = $subtotal + $tax;

echo "subtotal=" . $subtotal . "\n";
echo "tax=" . $tax . "\n";
echo "total=" . $total . "\n";

required setup Load required setup values before the main calculation that depends on them.