destructors

[Mike G]

So if I don't have anything specific to do when an object is no
longer referenced, I don't have to explicitly define a destructor
method? I am not required to free or delete each variable, am I?

Thanks, Mike



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[Joachim Weiß]

Re: destructors

Mike G schrieb:[color=blue]
> So if I don't have anything specific to do when an object is no
> longer referenced, I don't have to explicitly define a destructor
> method? I am not required to free or delete each variable, am I?[/color]
Normally you don't need a destructor. Because objects are only valid in
their scope.

function foo() {
$bar = new Something()
}

$bar will be created and destroyed everytime foo is called.

However you may want to have an explitzit destructor:
eg.

class Something{
var $fp;
// constructor
function Something(
$this->fp=fopen("some file","r");
}

// now you need to close the file when something is destroyed

//destructor
// watch the underscore
function _Something(
fclose($this->fp);
}


Hope it helps!

Jo

[Michael G]

Re: destructors

"Mike G" <mike-g@montana.com> wrote in message
news:1124208308 _2917@spool6-east.superfeed. net...[color=blue]
> So if I don't have anything specific to do when an object is no
> longer referenced, I don't have to explicitly define a destructor
> method? I am not required to free or delete each variable, am I?
>[/color]

In terms of freeing memory it makes sense that it isn't really an
issue with web applications. Once a request (script) has been
responded to, the server automagically restores the memory
used by the script.

Mike



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[Janwillem Borleffs]

Re: destructors

Joachim Weiß wrote:[color=blue]
> //destructor
> // watch the underscore
> function _Something(
> fclose($this->fp);
> }
>[/color]

I'm watching it, but all I can see is that you possibly mean the
__destruct() method available in PHP5...


JW

[Joachim Weiß]

Re: destructors

Janwillem Borleffs schrieb:[color=blue]
> Joachim Weiß wrote:
>[color=green]
>>//destructor
>>// watch the underscore
>>function _Something(
>>fclose($thi s->fp);
>>}
>>[/color]
>
>
> I'm watching it, but all I can see is that you possibly mean the
> __destruct() method available in PHP5...
>
>
> JW
>
>
>[/color]
Your right! I mixed it up with something else!
class Something{
var $fp;

class Something {
function __construct() {
$this->fp=fopen("some file","r");
}

function __destruct() {
fclose($this->fp);
}

}

[Peter Fox]

Re: destructors

Following on from Joachim Weiß's message. . .[color=blue]
>function foo() {
> $bar = new Something()
>}
>
>$bar will be created and destroyed everytime foo is called.[/color]

Q: As far as the PHP script is concerned $bar no longer exists and if
foo() is called again another $bar is created - That's fine.

But what is the garbage collection situation during the running of the
script, which could be important for large objects?


--
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