Call a class inside another class in PHP - php

Question

Hey there I'm wondering how this is done as when I try the following code inside a function of a class it produces some php error which I can't catch
public $tasks;
$this->tasks = new tasks($this);
$this->tasks->test();
I don't know why the initiation of the class requires $this as a parameter either :S
thanks
class admin
{
function validate()
{
if(!$_SESSION['level']==7){
barMsg('YOU\'RE NOT ADMIN', 0);
return FALSE;
}else{
**public $tasks;** // The line causing the problem
$this->tasks = new tasks(); // Get rid of $this->
$this->tasks->test(); // Get rid of $this->
$this->showPanel();
}
}
}
class tasks
{
function test()
{
echo 'test';
}
}
$admin = new admin();
$admin->validate();

Answer 1

You can't declare the public $tasks inside your class's method (function.) If you don't need to use the tasks object outside of that method, you can just do:
$tasks = new Tasks($this);
$tasks->test();
You only need to use the "$this->" when your using a variable that you want to be available throughout the class.
Your two options:
class Foo
{
public $tasks;
function doStuff()
{
$this->tasks = new Tasks();
$this->tasks->test();
}
function doSomethingElse()
{
// you'd have to check that the method above ran and instantiated this
// and that $this->tasks is a tasks object
$this->tasks->blah();
}
}
or
class Foo
{
function doStuff()
{
$tasks = new tasks();
$tasks->test();
}
}
with your code:
class Admin
{
function validate()
{
// added this so it will execute
$_SESSION['level'] = 7;
if (! $_SESSION['level'] == 7) {
// barMsg('YOU\'RE NOT ADMIN', 0);
return FALSE;
} else {
$tasks = new Tasks();
$tasks->test();
$this->showPanel();
}
}
function showPanel()
{
// added this for test
}
}
class Tasks
{
function test()
{
echo 'test';
}
}
$admin = new Admin();
$admin->validate();

Answer 2

You're problem is with this line of code:
public $tasks;
$this->tasks = new tasks();
$this->tasks->test();
$this->showPanel();
The public keyword is used in the definition of the class, not in a method of the class. In php, you don't even need to declare the member variable in the class, you can just do $this->tasks=new tasks() and it gets added for you.