Help me here. I've become a bitconfused about how PHP4 deals with
objects after reading this description of PHP5:
"PHP's handling of objects has been completely rewritten, allowing for
better performance and more features. In previous versions of PHP,
objects were handled like primitive types (for instance integers and
strings). The drawback of this method was that semantically the whole
object was copied when a variable was assigned, or pass as a parameter
to a method. In the new approach, objects are referenced by handle,
and not by value (one can think of a handle as an object's
identifier)."
I have always assumed that PHP4 uses a copy-on-write approach, so that
when you pass an object to a function by value, PHP doesn't actually
create a new copy of that object. 2 3265
With total disregard for any kind of safety measures ch***********@h otmail.com (Chung Leong) leapt forth and uttered: I have always assumed that PHP4 uses a copy-on-write approach, so that when you pass an object to a function by value, PHP doesn't actually create a new copy of that object.
In PHP4 all variables are passed by value unless you explicitly tell
it to pass by reference. So unless you use the & when passing an
object to a function/method PHP4 will create a copy.
--
There is no signature.....
Phil Roberts <ph*****@HOLYfl atnetSHIT.net> wrote in message news:<Xn******* *************** ***@206.127.4.2 2>... With total disregard for any kind of safety measures ch***********@h otmail.com (Chung Leong) leapt forth and uttered:
I have always assumed that PHP4 uses a copy-on-write approach, so that when you pass an object to a function by value, PHP doesn't actually create a new copy of that object.
In PHP4 all variables are passed by value unless you explicitly tell it to pass by reference. So unless you use the & when passing an object to a function/method PHP4 will create a copy.
The question is, does it create a physical copy (using up extra
memory) or a virtual copy (a physical copy happens only if one of the
copies is modified)? This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Tim Tyler |
last post by:
I'm sure this is a FAQ - but I could not find a coherent statement of the
answer:
Some of my clients want PHP4.
Other ones want PHP5.
Can I run both PHP4 and PHP5 under the same instance of Apache -
both on port 80 - using different file extensions to distinguish
between them?
--
|
by: Jan Pieter Kunst |
last post by:
(apologies if this message is a duplicate -- my news server seems to
have problems)
Greetings,
When using PHP 4, this:
// ex. 1
class A {
function A(&$obj) {
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by: Kevin |
last post by:
Hi all,
I've got a PHP4 app that I developed which I'm trying to get to run on a
PHP5 server. Everything works great, except for one thing.
There's a particular routine that creates an original object, then copies
it. (The object constructor gets some meta information from the database, so
I copy it for performance reasons). The routine then modifies the copies.
PHP5 copies by reference by default, so this doesn't work--- I'm not
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by: sinister |
last post by:
I'm starting a database/web interface project, using Linux and postgresql.
I've programmed in PHP4 in the past, and for this new project am unsure
whether to use PHP4 or PHP5.
My main concerns are stability and security.
What are the pros/cons/issues for PHP4/PHP5 with apache (either 1.3 or 2)?
TIA,
|
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last post by:
Hi
I've got a really strange problem, and can't find out why it's not
working as intended.
in order to use php4 and 5 together on a webserver and the requirement
for running as different users, I use suexec and a wrapper script for
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httpd.conf:
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last post by:
Hi there
I'm quite experienced in programming in PHP4, but I would like to make
a step to PHP5.
I created following class which works perfectly in PHP4 :
Class Nessi
{
// ident part
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last post by:
Hi,
I am slowly moving my code to php5.
But I would like to make it backward compatible in case something bad
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The way the constructors work seem to have changed quite a bit and I am
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// Some simple code/
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What kind, if any, problems will I have with the existing PHP code base?
I see:
Local Master
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