Casting objects in PHP

Gavin

Howdy,

Say i have 2 classes. A and B. B inherits from A.
I create 2 objects, of type a and type b.

$type_a = new a ;
$type_b = new b ;

Is there any way to cast type_a to type_b, retaining the values stored in type_a's variables ? I've seen a few people asking the question and cant find anything in the php manual that might do it.

Anyone got any ideas ?
Gav

Shiminay

Maybe a swap class - set type_c as a's values, cast a and then pop the values back in?

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Dav
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Void

Warning: Unhelpful post:

This sounds like the stuff that you can do in C++ but aren't really supposed to do because it's really bad. If you actually find yourself doing this in code then your object model is flawed.

[This message has been edited by Void (edited 02-06-2001).]

phil

<font face="Verdana, Arial" size="2">Originally posted by Verb:
Howdy,

Say i have 2 classes. A and B. B inherits from A.
I create 2 objects, of type a and type b.

$type_a = new a ;
$type_b = new b ;

Is there any way to cast type_a to type_b, retaining the values stored in type_a's variables ? I've seen a few people asking the question and cant find anything in the php manual that might do it.

Anyone got any ideas ?
Gav

</font>

This doesn't work. PHP variables have basic types, i.e. String, int, Object.
You can typecast from an int to an Object.

If you want to copy over the values, create a function within a, which uses references to copy over the values into an object b.

If you're still having trouble with the concept, I'll throw you up an example.
But simply,
a.copyValue(b);
Is what I'm talking about.
Phil.