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Date: Wed, 03 Nov 2004 18:25:45 +0100
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To: Jochem Maas <jochem@iamjochem.com>
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Subject: Re: [PHP-DEV] serialize bug with array that references to itself?
From: php@hristov.com (Andrey Hristov)

  Hi,
print_r() and var_dump() are quite different in their nature.
print_r() is a thin wrapper around an internal Zend function
(as far as I remember) while var_dump() is in ext/standard/var.c
The do more or less the same job still some differences in the
output (print_r() shows nothing on NULL variables which I find
clumsy since lack of output where I expect ouput makes me
suspicious).

Andrey

Jochem Maas wrote:
> Andrey Hristov wrote:
> 
>>  Well, when there is traversion inside the engine, it checks whether 
>> it has
>> processed a "node" already several times. As far as I remember the 
>> threshold
>> is 3. So once it goes over $Arr, the counter increases to 1, the 
>> second time
>> to 2 and third time it is 3 and ZE reports recursion.
> 
> 
> is there good reason to set the threshold at 3 iso 2?
> 
> when dumping out objects that make heavy use of 'parent' references this 
> leads to tons of extra output which would be greatly cutdown if the 
> threshold was 2 iso 3.
> 
> just to make the point, print_r seems to use a threshold of 2 (which is 
> why I always try print_r before taking my chances with var_dump):
> 
> <?php
> 
> class a { public $self; }
> 
> $A = new a;
> $A->self = $A;
> var_dump( $A );
> print_r( $A );
> 
> ?>
> 
>>
>> HTH,
>> Andrey
>>
>> Francisco M. Marzoa Alonso wrote:
>>
>>> BTW., I'm not sure that there's nothing more wrong here. Takin the 
>>> first part of the code of first example:
>>>
>>> <?php
>>>
>>> $Arr = array();
>>> $Arr['self'] = &$Arr;
>>> var_dump ( $Arr );
>>>
>>> ?>
>>>
>>> It returns:
>>>
>>> array(1) {
>>> ["self"]=>
>>> array(1) {
>>>   ["self"]=>
>>>   *RECURSION*
>>> }
>>> }
>>>
>>> Is that as its expected to be? I meant that perhaps it should be:
>>>
>>> array(1) {
>>>   ["self"]=>
>>>   *RECURSION*
>>> }
>>>
>>> Since the element in $Arr['self'] is yet (or at least should be) a 
>>> reference to itself...
>>>
>>
>