Static Class Member References
| From: | Daniel Kolbo | Date: | Sun, 11 Jul 2010 22:19:25 +0000 |
| Subject: | Static Class Member References | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-306827@lists.php.net to get a copy of this message | ||
Hello PHPers,
I'm having some trouble understanding some PHP behaviour. The following
example script exhibits the behaviour which I cannot understand.
[code]
<?php
class A
{
public static $a = 3;
function __construct()
{
//self::$a = $this; //[i]
self::$a =& $this; //[ii]
}
}
class B extends A
{
function __construct()
{
parent::__construct();
}
}
class C {
var $c;
function __construct()
{
$this->c =& A::$a;
}
}
$c = new C;
$b = new B;
$cee = new C;
var_dump($c->c); // [i] prints object(B), but [ii] prints int 3
var_dump($cee->c); // [i] prints object(B), and [ii] prints object(B)
?>
[/code]
Why does $c->c print 'int 3' ?
I'm nervous to use "self::$a = $this;" because I don't want to be
copying the whole object. However, isn't $this just a reference to the
object, so "self::$a = $this;" is just copying the reference and not the
actual object, right?
Thanks in advance
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