Illegal Offset Type For Array. Object To Integer Convertion

The code is as ...

$folderlistfile = $path."xmlfile.xml";

/*

<list>
<details id="2">
<name>Books</name>
<mainid>0</mainid>
</details>
<details id="1003">
<name>CDs</name>
<mainid>0</mainid>
</details>
</list>

*/

$list = simplexml_load_file($folderlistfile);

foreach($list as $sno=>$details) {
if($details->isdeletable) {
if($details->mainid) {

echo "<br /mainid = ".$details->mainid." : id =
".$details['id']." ";
var_dump($details->mainid);
$mainid = $details->mainid;
settype($mainid, "integer");
var_dump($mainid);

// I want to save the details in an array
//$listarr[$mainid][] = $details['id']; //Warning: Illegal offset
type
//$listarr[$details->mainid][] = $details['id']; //Warning: Illegal
offset type
}
}
}

echo, var_dump will output as follow ...

mainid = 0 : id = 2
object(SimpleXMLElement)#5 (1) { [0]= string(1) "0" }
UNKNOWN:0

mainid = 0 : id = 1003
object(SimpleXMLElement)#4 (1) { [0]= string(1) "0" }
UNKNOWN:0

Both of this generate the error : Warning: Illegal offset type

$listarr[$mainid][] = $details['id']; //Warning: Illegal offset type
$listarr[$details->mainid][] = $details['id']; //Warning: Illegal
offset type

and page doesn't execute furthur of this line.

I suppose it is because the array key is an object. How do I convert it
to integer.

print_r($details->mainid) displays SimpleXMLElement Object ( [0] =0
)
print_r($mainid) : nothing is displyed. even mainid = 0 : id = 2 is
not displayed.


System: free bsd, php 5

As is mentioned in the code, I want to craete an array as

either
$listarr[$mainid][] = $details['id']; //Warning: Illegal
offset type
or
$listarr[$details->mainid][] = $details['id']; //Warning:
Illegal offset type

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