Calling class properties / methods from a different class' method?

[SystemOverload]

Hi

 

Can you call Class A's methods or properties from Class B's methods?

 

Thanks.

[Maq]

Check out - http://us2.php.net/manual/en/language.oop5.visibility.php

[SystemOverload]

Thanks, but that didn't help.  The properties are public, or at least some are, but the object is not recognised:

 

Notice: Undefined variable: objSession in C:\WEBSERVER\system\classes\clAccount.class on line 9 Notice: Trying to get property of non-object in C:\WEBSERVER\system\classes\clAccount.class on line 9 

 

Can you give me a yes/no?  Should I be able to access Class A's properties and methods from Class B's methods?

[KevinM1]

The answer is a qualified 'yes', depending on how you've set things up.  If you want help, show your code rather than talk in vague generalizations.

[xyph]

This might help you understand how you can have two classes interact with each other. This doesn't touch on inheritance, which can be read about here: http://php.net/manual/en/language.oop5.inheritance.php

 

<?php 

$obj = new b();

echo $obj->callToA();
echo '<br>';

$obj2 = new a();

echo $obj->thisNeedsA( $obj2 );

class a {

public $property = 'hello world';

public function method( $argument ) {
	return $this->property . ', ' . $argument;
}

}

class b {

public $object;

public function __construct() {
	$this->object = new a();
}

public function callToA() {
	return $this->object->method('i love you');
}

public function thisNeedsA( a $obj ) {
	$obj->method('you love me');
}

}

?>

[SystemOverload]

Apologies, I thought I'd been quite clear in my question.  Let me layout exactly what I want to know is possible or not:

 

class clClassA {

public varA;

function clClassA {
...blah...
$this->varA = 999;
...blah...
}

function fnFunctionA {
<does something else>
}

}


class clClassB {

function clClassB {
echo $objA::varA;
}
}


objA = new clClassA;
objB = new clClassB; 

 

 

I want objB to be able to access objA::varA or execute objA::fnFunctionA

 

IE: access one class' properties/methods from within another class' methods.  I do not want to instigate things or access properties from outside of the classes.

 

Is my question clearer now?

 

Thnx

[xyph]

Only if you use static methods, which I don't suggest in this case.

 

My examples touched on exactly how you can do this.

<?php 

// METHOD ONE
$obj = new static_b();
echo $obj->get_varA();

class static_a {
public static $varA = 'hello world';
}
class static_b {
public function get_varA() {
	return static_a::$varA;
}
}

// METHOD TWO (BETTER IMO)
$obj = new object_b();
echo $obj->get_varA();

class object_a {
public $varA = 'hello world';
}
class object_b {
public function get_varA() {
	$obj = new object_a();
	return $obj->varA;
}
}

// METHOD THREE (YOU DON'T LIKE, BUT HAS IT'S PLACE)
$objA = new passing_a();
$objB = new passing_b();
echo $objB->get_varA( $objA );

class passing_a {
public $varA = 'hello world';
}
class passing_b {
public function get_varA( passing_a $obj ) {
	return $obj->varA;
}
}

?>

[SystemOverload]

1 and 2 didn't seem to work and I didn't like the look of 3, so steered clear. 

 

I went with extending ClassB from ClassA.  Instantiated ClassB, which had a constructor that called ClassA's constructor.  This then allowed me to call ClassA's variable from inside CLassB as "$this->variable".

 

 

[xyph]

Didn't seem to work? What does that mean? My examples work flawlessly.

 

Regardless, glad you found your solution through inheritance.