declaring variable and function in PHP class

[pman]

I'm trying to get into writing OOP in PHP. Using PHP5. I know the basic structure of a class, variable and functions, but getting confused when looking at different tutorial.

Inside a class, some are declaring function like:

public function doSomething() 

while others are writing

public doSomething() 

Some are even writing

function doSomething() 

Now, what is the difference in here? Who is right? I think the first two are more like how OOP should be (correct me if I'm wrong).

And, what about declaring variables? I believe it should it be:

public $myVar 

Hope you can clarify my confusion here. Thanks

[alexjewell]

Check out PHP.net's explanation:

http://www.php.net/public

[boogyman]

public function doSomething()

the first one is syntactically the most correct, however PHP5 might possibly allow the others

[Master_script_maker]

if it is not declared PHP 5 declares it as public, but it is a good practice to always define it. Here is how the visibility works:

class myClass {
public $public="public";
private $private="private";
protected $protected="protected";

public function print_vars() {
echo $this->public;
echo $this->private;
echo $this->protected;
}
}
class myClass2 extends myClass {
public function print_vars2() {
echo $this->public;
echo $this->private;
echo $this->protected;
}
}
$test1=new myClass;
$test2=new myClass2; 

Here is how it would output:
echo $test1->public; - "public"
echo $test1->private; - fatal error
echo $test1->protected; - fatal error
echo $test2->public; - "public"
echo $test2->private; - undefined
echo $test2->protected; - fatal error
$test1->print_vars(); - "public" "private" "protected"
$test2->print_vars2(); - "public" undefined "protected"