Groups > comp.lang.php > #3470 > unrolled thread

declaring private variable in class

Started by	DavidB <davidbrotman2768@gmail.com>
First post	2011-10-20 13:56 -0700
Last post	2011-10-20 17:29 -0500
Articles	3 — 3 participants

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  declaring private variable in class DavidB <davidbrotman2768@gmail.com> - 2011-10-20 13:56 -0700
    Re: declaring private variable in class Gregor Kofler <usenet@gregorkofler.com> - 2011-10-20 23:20 +0200
      Re: declaring private variable in class Robert Heller <heller@deepsoft.com> - 2011-10-20 17:29 -0500

#3470 — declaring private variable in class

From	DavidB <davidbrotman2768@gmail.com>
Date	2011-10-20 13:56 -0700
Subject	declaring private variable in class
Message-ID	<6133623.1088.1319144190478.JavaMail.geo-discussion-forums@prfp13>

Hi:

I created a class and then declared a private variable called today and set it = to today's date:

class someclass
{
private $today = date("Y-m-d");
}

For some reason, it doesn't like it. There is an error message about the parenthesis. Am I not allowed to set a variable = to some function like date or whatever? It didn't complain when I set it = to some string constant like "2011-10-10".

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#3471

From	Gregor Kofler <usenet@gregorkofler.com>
Date	2011-10-20 23:20 +0200
Message-ID	<j7q3a8$r3o$1@dont-email.me>
In reply to	#3470

Am 2011-10-20 22:56, DavidB meinte:
> Hi:
> 
> I created a class and then declared a private variable called today and set it = to today's date:
> 
> class someclass
> {
> private $today = date("Y-m-d");
> }
> 
> For some reason, it doesn't like it. There is an error message about the parenthesis. Am I not allowed to set a variable = to some function like date or whatever? It didn't complain when I set it = to some string constant like "2011-10-10".

RTFM.

"This declaration may include an initialization, but this initialization
must be a constant value--that is, it must be able to be evaluated at
compile time and must not depend on run-time information in order to be
evaluated"

http://www.php.net/manual/en/language.oop5.properties.php


HTH, Gregor

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#3472

From	Robert Heller <heller@deepsoft.com>
Date	2011-10-20 17:29 -0500
Message-ID	<YeKdnQfg5rNKPT3TnZ2dnUVZ_oCdnZ2d@posted.localnet>
In reply to	#3471

At Thu, 20 Oct 2011 23:20:08 +0200 Gregor Kofler <usenet@gregorkofler.com> wrote:

> 
> Am 2011-10-20 22:56, DavidB meinte:
> > Hi:
> > 
> > I created a class and then declared a private variable called today and set it = to today's date:
> > 
> > class someclass
> > {
> > private $today = date("Y-m-d");
> > }
> > 
> > For some reason, it doesn't like it. There is an error message about the parenthesis. Am I not allowed to set a variable = to some function like date or whatever? It didn't complain when I set it = to some string constant like "2011-10-10".
> 
> RTFM.
> 
> "This declaration may include an initialization, but this initialization
> must be a constant value--that is, it must be able to be evaluated at
> compile time and must not depend on run-time information in order to be
> evaluated"
> 
> http://www.php.net/manual/en/language.oop5.properties.php

In other words, you need to write a constructor method, which in turn
can initialize the private variable to a computed value.  It is one of
the things constructor methods are for.

> 
> 
> HTH, Gregor
>                 

-- 
Robert Heller             -- 978-544-6933 / heller@deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
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