Php Calculating two functions [closed] - php

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I am writing a program in which I want to plus two functions together and in the end I want to calculate the total. if anyone can help with this it will be appreciated.
const PRICE_OF_Big_Mac = 2.50;
public $Big_Mac = 0;
public function calculate_dinein_price(){
$dine = 0.00;
$dine += $this->Big_Mac * self::PRICE_OF_Big_Mac;
return $dine;
}
public function calculate_dinein_total(){
$total_dine = 0.00;
$total_dine = $total_dine + $dine;
return $total_dine;
}
but this doesn't work.

Answer 1

You can't access $dine in your second function because it's nowhere defined. The $dine from your first function is only a local variable.
I would suggest this solution which uses the fact that calculate_dinein_price() also returns the value of $dine:
public function calculate_dinein_total(){
$total_dine = 0.00;
$total_dine = $total_dine + $this->calculate_dinein_price();
return $total_dine;
}