Php 5 : polymorphic class

[Baptiste Pillot]

Hello,
With php4 I did the following in class initialisation :

class base_class {

function modify_polymorphic($otherclass){
$this=new $otherclass();
}

function other_function(){
echo "Base method";
}

}

class herited_class extends base_class {

function other_function(){
echo "Herited method";
}

}

$base=new base_class();
$base->modify_polymorphic("herited_class");
$base->other_function();

This will echo "Herited method" in PHP 4.
But in PHP 5 it does not wand to work at all.
PHP interpreter says :

Fatal error: Cannot re-assign $this in scriptname.php on line 10

[Jerry Stuckle]

Baptiste Pillot wrote:

Hello,
With php4 I did the following in class initialisation :

class base_class {

function modify_polymorphic($otherclass){
$this=new $otherclass();
}

function other_function(){
echo "Base method";
}

}

class herited_class extends base_class {

function other_function(){
echo "Herited method";
}

}

$base=new base_class();
$base->modify_polymorphic("herited_class");
$base->other_function();

This will echo "Herited method" in PHP 4.
But in PHP 5 it does not wand to work at all.
PHP interpreter says :

Fatal error: Cannot re-assign $this in scriptname.php on line 10

That is correct. It's never been valid to reassign $this. But previous
versions of PHP let it by.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attglobal.net
==================

[Mladen Gogala]

On Mon, 10 Oct 2005 20:24:51 +0200, Baptiste Pillot wrote:

Fatal error: Cannot re-assign $this in scriptname.php on line 10

$this is something that points to current object. Reassigning $this is
like flying by pulling your hair. Ain't possible.

--
http://www.mgogala.com

[Tony Marston]

"Jerry Stuckle" <js*******@attglobal.net> wrote in message
news:Sb********************@comcast.com...

Baptiste Pillot wrote:

Hello,
With php4 I did the following in class initialisation :

class base_class {

function modify_polymorphic($otherclass){
$this=new $otherclass();
}

function other_function(){
echo "Base method";
}

}

class herited_class extends base_class {

function other_function(){
echo "Herited method";
}

}

$base=new base_class();
$base->modify_polymorphic("herited_class");
$base->other_function();

This will echo "Herited method" in PHP 4.
But in PHP 5 it does not wand to work at all.
PHP interpreter says :

Fatal error: Cannot re-assign $this in scriptname.php on line 10

That is correct. It's never been valid to reassign $this. But previous
versions of PHP let it by.

You sample code also shows that you do not understand what "polymorphism"
actually means.

--
Tony Marston

http://www.tonymarston.net

[Jerry Stuckle]

Tony Marston wrote:

"Jerry Stuckle" <js*******@attglobal.net> wrote in message
news:Sb********************@comcast.com...

Baptiste Pillot wrote:

Hello,
With php4 I did the following in class initialisation :

class base_class {

function modify_polymorphic($otherclass){
$this=new $otherclass();
}

function other_function(){
echo "Base method";
}

}

class herited_class extends base_class {

function other_function(){
echo "Herited method";
}

}

$base=new base_class();
$base->modify_polymorphic("herited_class");
$base->other_function();

This will echo "Herited method" in PHP 4.
But in PHP 5 it does not wand to work at all.
PHP interpreter says :

Fatal error: Cannot re-assign $this in scriptname.php on line 10

That is correct. It's never been valid to reassign $this. But previous
versions of PHP let it by.

You sample code also shows that you do not understand what "polymorphism"
actually means.

Noe my code...
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attglobal.net
==================