in_array() to find an object inside an array

From: Phil Powell (soazine_at_erols.com)
Date: 03/29/04 

Date: 29 Mar 2004 13:05:40 -0800

[PHP]
           if (is_array($_POST["assoc_$key"])) {
            foreach ($this->getAssocSectionsObjArray($key, $dbAP) as
$obj) {
             print_r($obj); print_r(" in array? ");
print_r(in_array($obj, $result)); print_r("<P>");
             if (!in_array($obj, $result)) array_push($result, $obj);
            }
           }
[/PHP]

Here is the output of the result of this script:

[Quote]
stdClass Object ( [id] => 2 [placement_name] => Placement #1 ) in
array?
Warning: in_array(): Wrong datatype for first argument in
/image_catalog/include/classes.inc.php on line 99

Warning: in_array(): Wrong datatype for first argument in
/www/html/mu-spin/image_catalog/include/classes.inc.php on line 100
stdClass Object ( [id] => 4 [placement_name] => Placement #10 ) in
array?
Warning: in_array(): Wrong datatype for first argument in
/image_catalog/include/classes.inc.php on line 99

Warning: in_array(): Wrong datatype for first argument in
/www/html/mu-spin/image_catalog/include/classes.inc.php on line 100
stdClass Object ( [id] => 6 [placement_name] =>
[url]http://blah.com[/url] ) in array?
Warning: in_array(): Wrong datatype for first argument in
/image_catalog/include/classes.inc.php on line 99

Warning: in_array(): Wrong datatype for first argument in
/image_catalog/include/classes.inc.php on line 100
[/Quote]

What I have to do is compare an array of objects, $result, with
another array of objects, $this->getAssocSectionsObjArray($key,
$dbAP). Both arrays will be identical in structure and object
formatting, but not in object data content. What I need to do is to
find out if that one array has the very same object as the other, then
don't add it to $result, otherwise, add to $result.

The object formatting is as follows:

[Quote]obj: stdClass Object ( [id] => 2 [placement_name] => Placement
#1 )[/Quote]

And $result can look like this:

[Quote]
result: Array ( [0] => stdClass Object ( [id] => 6 [placement_name] =>
Placement #27 ) [1] => stdClass Object ( [id] => 2 [placement_name] =>
Placement #1 ) )
[/Quote]
I don't wish to loop through both arrays, that would be a performance
nightmare to do that. Is there a version of in_array in existence for
comparing objects?

Thanx
Phil

PS: I went to this manual example at
[url]http://us3.php.net/manual/en/function.in-array.php#40079[/url]
but that involves recursive handling and object rebuilding - this,
were I to figure out what the living blue it is, would have to be put
inside another loop.. OUCH!

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