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Date: Mon, 24 Jul 2006 11:12:30 -0500
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Message-ID: <200607241112.31285.boards@gmail.com>
Subject: Re: [PHP-DEV] Pass by reference (5.1.1 vs 5.1.2)
From: boards@gmail.com (Matt Sicker)

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On Monday 24 July 2006 10:52, Rishad Omar wrote:
> Hello,
>
> I've upgraded from 5.1.1 to 5.1.2 and discovered the following
> unexpected difference. Best shown by example.
>
> <?
>     function getArray(&$arr)
>     {
>         $arr[] =3D 12;
>     }
>
>     getArray($p =3D array());
>     print_r($p);
> ?>
>
> In php 5.1.1, the $p is passed correctly as reference and so returns
> with the value 12 in its first element. I regard this as correct
> behaviour. In php 5.1.2, the $p is passed by value. So on return, $p
> is still empty! This can be fixed as follows:
>     $p =3D array();
>     getArray($p);
>
>
>
> The following example works, as expected, in both 5.1.1 and 5.1.2.
>
> <?
> class A
> {
>         public $i =3D 9;
> }
>
>
> function doAmend(A &$a) // & not required because class instance
> passed by reference by default
> {
>         $a->i +=3D 30;
> }
>
>         doAmend($b =3D new A);
>         print_r($b);      // this prints the value of member i as 39
> as expected.
>
> ?>
I'm guessing it has something to do with a memory leak.  Either that, or=20
scope; creating a variable inside of a function call probably goes out=20
of scope after the function returns.  Enable error_reporting(E_ALL|
E_STRICT) and see what happens.
=2D-=20
Matt Sicker

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