[PHP] Classes, Constructors, References and Recursion
Hi,
I have this piece of code:
class test1 {
var
$data = 'hi',
$node = false;
function test1() {
$this-node = new test2($this);
}
}
class test2 {
var
$data = 'yoyo',
$root = false;
function test2($root) {
$this-root = $root;
}
}
$test = new test1();
echo('pre');
print_r($test);
echo('/pre');
And it outputs:
test1 Object
(
[data] = hi
[node] = test2 Object
(
[data] = yoyo
[root] = test1 Object
(
[data] = hi
[node] = *RECURSION*
)
)
)
while it should output:
test1 Object
(
[data] = hi
[node] = test2 Object
(
[data] = yoyo
[root] = *RECURSION*
)
)
I know there are some difficulties using references in constructors, but
I think this should be right..
I'm using PHP/4.3.11. Can anyone tell me what is wrong with this code or
why PHP behaves this way?
regards,
Evert
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Re: [PHP] Classes, Constructors, References and Recursion
Evert|Rooftop Solutions wrote:
Hi,
I have this piece of code:
class test1 {
var
$data = 'hi',
$node = false;
function test1() {
$this-node = new test2($this);
}
}
class test2 {
var
$data = 'yoyo',
$root = false;
function test2($root) {
$this-root = $root;
}
}
$test = new test1();
echo('pre');
print_r($test);
echo('/pre');
And it outputs:
test1 Object
(
[data] = hi
[node] = test2 Object
(
[data] = yoyo
[root] = test1 Object
(
[data] = hi
[node] = *RECURSION*
)
)
)
while it should output:
test1 Object
(
[data] = hi
[node] = test2 Object
(
[data] = yoyo
[root] = *RECURSION*
)
)
does the output of print_r() correlate with whats actually
happening? i.e. is the first test1 object not a reference of the
second test1 object (as per the print_r() dump).
what does the following show? (I don't have php4 at hand):
var_dump($test);
also I believe print_r() and var_dump() have a few odditities regarding
display of recursion with regard to objects... internals mailinglist archive
might tell you more on that.
does the following show different output?
?php
class test1
{
var $data = 'hi', $node = false;
function test1()
{
$this-node = new test2();
$this-node-root = $this;
}
}
class test2 { var $data = 'yoyo', $root = false; }
$test = new test1();
echo pre;
print_r($test); echo hr /; var_dump($test);
echo /pre;
?
I know there are some difficulties using references in constructors, but
I think this should be right..
I'm using PHP/4.3.11. Can anyone tell me what is wrong with this code or
why PHP behaves this way?
go for php5 if you can, you'll have alot more fun with object then :-)
no more ''s for starters.
regards,
Evert
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Classes, Constructors, References and Recursion
Jochem Maas wrote: also I believe print_r() and var_dump() have a few odditities regarding display of recursion with regard to objects... internals mailinglist archive might tell you more on that. I think I have the answer, when I pass a var to print_r it isn't passed by reference, so there will be a copy made immediately. go for php5 if you can, you'll have alot more fun with object then :-) no more ''s for starters. God I wish I could! The thing is, most hosting company's don't support it yet, and since I'm making a product that should run (and is already running) at various places, I have to use PHP4 :( thanx man, Evert -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
