Creating default object from empty value in php 5.4 - php

Question

i have some code like this:
function getAuthorizedPFComponents($pfState)
{
$authorizedPFComponents = new \stdClass();
$compTypeMap=array('platform'=>'pfAuthorizations','mainSite'=>'mainSiteAuthorizations','microSites'=>'microSiteAuthorizations','apps'=>'appAuthorizations');
foreach($compTypeMap as $compType=>$tagName)
{
$authorizationsNode=$this->pfAuthXMLDOM->getElementsByTagName($tagName)->item(0);
foreach($authorizationsNode->getElementsByTagName('authorizations') as $pfComponentAuthElem)
{
foreach($pfComponentAuthElem->getElementsByTagName('allow') as $allow)
{
switch($allow->getAttribute('orgCode'))
{
case 'K_ALL':
{
$authorizedPFComponents->$compType->{$pfComponentAuthElem->getAttribute('pfComponentCode')}->storeCode=$allow->getAttribute('storeCode');
}
}
It shows a warning:
Warning: Creating default object from empty value
The warning is traced back to the code under case K_ALL:

Answer 1

This was too long for a mere comment, so I'll remove it when it has outlived its usefulness.
First thing you should do is make the code simpler; there's a lot of stuff going on in that one statement:
$compCode = $pfComponentAuthElem->getAttribute('pfComponentCode');
$storeCode = $allow->getAttribute('storeCode');
And add debug code:
var_dump($authorizedPFComponents->$compType);
var_dump($authorizedPFComponents->$compType->$compCode);
$authorizedPFComponents->$compType->$compCode->storeCode = $storeCode;
Consider this code:
$x->y = 'test';
If $x is not defined, it will issue a warning:
Warning: Creating default object from empty value in xxx
The same goes for your chain of references:
$authorizedPFComponents->$compType->$compCode->storeCode
If any of those paths is empty, the next ->yyy will cause that warning.