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Jul 8th, 2007

Class question

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How can I use variable from the outside of the class? For example:

PHP Syntax (Toggle Plain Text)
<?php
   $outside = 'Hello';
 
   class A {
       function printme() {
           print $outside;
       }
    }
 
   $cls = new A();
   $cls->printme();
?>
<?php
   $outside = 'Hello';

   class A {
       function printme() {
           print $outside;
       }
    }

   $cls = new A();
   $cls->printme();
?>

How can I do it? please

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invisal

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Jul 8th, 2007

Re: Class question

Hi. You can use :

php Syntax (Toggle Plain Text)
function printme() {
 
           global $outside;
           print $outside;    }
function printme() {

           global $outside;
           print $outside;    }

- Mitko Kostov

Last edited by MitkOK; Jul 8th, 2007 at 7:37 am.

MitkOK

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Jul 8th, 2007

Re: Class question

Oh thanks you

invisal

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Jul 8th, 2007

Re: Class question

Yes.. because within a function, it has it's own scope issues, if you use the global keyword, you can access vairables/stuff outside the scope of this function.

Thus, doing a global of your $outside vairable, makes it local within your function.
However, if you change the value of $outside, it will be changed globally, not locally in the function...

Another method would be passing the $outside variable as a paramtere to the function like so..

PHP Syntax (Toggle Plain Text)
$variable = "hello";
 
function printme($variable) {
 
    print $variable;
}
$variable = "hello";
 
function printme($variable) {
 
    print $variable;
}

Any questions. just ask.
Cheers.

dr4g

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Jul 8th, 2007

Re: Class question

Another question:

PHP Syntax (Toggle Plain Text)
	class A{
		public $msg = '';
 
		public function set_msg($new_msg) {
			global $msg;
			$msg = $new_msg;
		}
	}
 
	$message = new A();
	$message->set_msg('Hello World');
	print $message->msg;
	class A{
		public $msg = '';

		public function set_msg($new_msg) {
			global $msg;
			$msg = $new_msg;
		}
	}

	$message = new A();
	$message->set_msg('Hello World');
	print $message->msg;

Why this code doesn't work as what I expect

Last edited by invisal; Jul 8th, 2007 at 11:47 am.

invisal

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Jul 8th, 2007

Re: Class question

What happens when you print it ?

dr4g

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Jul 8th, 2007

Re: Class question

Probally, nothing is printed. EMPTY

invisal

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Re: Class question

You should use

php Syntax (Toggle Plain Text)
$this->msg = $new_msg;
$this->msg = $new_msg;

instead of

php Syntax (Toggle Plain Text)

$msg = $new_msg;

- Mitko Kostov

Last edited by MitkOK; Jul 8th, 2007 at 12:14 pm.

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Jul 8th, 2007

Re: Class question

Worked!!! Thanks you... sorry to ask many question...

But I am really new at that CLASS system in PHP

thanks
ago.

invisal

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Jul 8th, 2007

Re: Class question

Yes, that's correct.

You've declared $msg as an instance variable of the class, so to refer to it you would do $this->variable.
Same if u have another function in the same class, you could call it by doing $this->function();

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