Php function call from another function - php

Question

I am trying to make a text game in PHP but i have problem since i am programing in php for few days. I need to call function attack (I need $_mainAttack since it is combination of $_baseAttack and special attack) from defend function so i can calculate the health loss I have placed -5 just to see if it is working..
Also in health i need attack to be able to lower hp so i could calculate the hp loss. My do while loop is wrong and i need help to make it functional. I want when health goes lower than 0 to exit the loop. When it exits the loop it will print game over. I am stuck in endless loop and i have no idea how to fix this.
This is index.php:
<?php
include 'Duel.php';
$duel = new Duel();
$duel->attack();
$duel->defend();
?>
This is my class duel:
<?php
class Duel{
public $_maxHealth = 20;
public $_currentHealth;
public $_baseAttack, $_specialAttack, $_mainAttack;
public $_specialChance, $deflectChance;
public $_defense;
function __construct()
{
echo 'begining of attack <br/>';
}
function attack()
{
$_specialChance = rand(0, 20);
$_specialAttack = 0;
if ($_specialChance < 10) {
$_specialAttack = 0;
} elseif ($_specialChance < 15) {
$_specialAttack = (int) rand(0, 5);
} elseif ($_specialChance <= 20) {
$_specialAttack = (int) rand(5, 10);
}
$_baseAttack = rand(1, 6);
$_mainAttack = $_baseAttack + $_specialAttack;
echo "Base attack is $_baseAttack: and special attack is : $_specialAttack attack is : $_mainAttack<br/>";
}
function defend()
{
$_maxHealth = 20;
do{
$deflectChance = rand(1, 10);
$deflect = 0;
if ($deflectChance < 5) {
$deflect = 0;
echo 'attack cannot be deflected';
}
elseif ($deflectChance > 5) {
$deflect = (int) rand(0, 3);
echo "attack is deflected for {$deflect} damage";
}
$_currentHealth = $_maxHealth + $deflect - 5;
echo "<br/>health is {$_currentHealth} <br/>";
}while($_currentHealth > 0);
if($_currentHealth > 0) echo "Game over";
}
} //end of class

Answer 1

You are always calculating $_currentHealth based on $_maxHealth, not the previous $_currentHealth.
Add before the loop:
$_currentHealth = $_maxHealth;
And change $_currentHealth = $_maxHealth + $deflect - 5; to:
$_currentHealth = $_currentHealth + $deflect - 5;

Answer 2

You can try returning the main attack variable from the attack function and simply call it on the defend function.

Answer 3

you are calculation $_mainAttack but doesn't subtract it from your health, therefore your player can't die and you end within an endless loop.