Hi, Thanks for your reply. After a sleep overnight I found I said something really stupid. Arrays are compared in deep, and also for objects. I really forgot the old PHP4 way and thought PHP5 compares object simply by address when using ==, which is not the real case. I need to use === for comparing objects of the same instance. And thanks Tom for pointing out to use the strict parameter. On 11/4/06, Richard Lynch <ceo@xxxxxxxxx> wrote:
> Try providing a custom comparison function. > > Almost for sure, PHP is attempting to "test" the == by a deeper scan > than you think. > > On Fri, November 3, 2006 10:56 am, tamcy wrote: > > Hello all, > > > > I'm new to this list. To not flooding the bug tracking system I hope > > to clarify some of my understanding here. > > > > I am referring to the (now bogus) bug report > > http://bugs.php.net/bug.php?id=39356&edit=2. This happens after my > > upgrade to PHP 5.2, where the code shown produces a "Fatal error: > > Nesting level too deep - recursive dependency?". Same testing code > > reproduced below: > > > > ---------------------------- > > <?php > > class A > > { > > public $b; > > } > > > > class B > > { > > public $a; > > } > > > > $a = new A; > > $b = new B; > > $b->a = $a; > > $a->b = $b; > > > > $test = array($a, $b); > > > > var_dump(in_array($a, $test)); > > ---------------------------- > > > > I think this is not rare for a child item to have knowledge about its > > parent, forming a cross-reference. > > > > This code runs with no problem in PHP5.1.6, but not in 5.2. Ilia > > kindly points out that "In php 5 objects are passed by reference, so > > your code does in > > fact create a circular dependency.". I know the passed by reference > > rule. What I'm now puzzled is, why this should lead to an error. > > > > To my knowledge, despite the type-casting issue and actual algorithm, > > in_array() should actually do nothing more than: > > > > function mimic_in_array($search, $list) > > { > > foreach ($list as $item) > > if ($search == $item) > > return true; > > return false; > > } > > > > Which means: > > 1. in_array() isn't multi-dimensional. > > 2. in_array() doesn't care about the properties of any object. > > > > That is, I don't expect in_array() to nest through all available inner > > arrays for a match, not to mention those are object properties, not > > arrays. > > > > So here is the question: Why should in_array() throws such a "Fatal > > error: Nesting level too deep" error? Why should it care? Is there any > > behaviour I don't know? > > > > Thanks all in advance. > > > > Tamcy > > > > -- > > PHP General Mailing List (http://www.php.net/) > > To unsubscribe, visit: http://www.php.net/unsub.php > > > > > > > -- > Some people have a "gift" link here. > Know what I want? > I want you to buy a CD from some starving artist. > http://cdbaby.com/browse/from/lynch > Yeah, I get a buck. So? > >
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