Description:
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I have a medium-sized php applications (~20000 lines), which starts to produce a few problems.

Sometimes, variables mix up:
i.e. i create a new instance $root of class "CBXTreeNode", but only 3 lines later, suddenly the class type (checked using get_class()) of $root is "CBXWorkflow", and the value is the one of another variable in the same function.

But between these lines, i didn't even touch the variable...

In some places, a similar problem shows up:
I instanciate a class CBXTreeNode, but if i do get_class($variable), it returns "cbxtreenodd" instead of ctxtreenode.

Unfortunately i could not reproduce it on every server, on my development server it works, on the production server, it doesn't :( 

Also, the exact same source works outside my application, on the same server.

I updated PHP from 4.2.3 to 4.3.6, but no change.



Reproduce code:
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$root = $treemgr->getRootNode();		
echo "root is class ".get_class($root)."<br>";

$workflow =& $this->getWorkflow();
echo "workflow is class ".get_class($workflow)."<br>";

echo "root is class ".get_class($root)."<br>";


// **Output in my application**
// root is class CBXTreeNode
// workflow is class SPWorkflow
// root is class SPWorkflow


Expected result:
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Output should be:

root is class CBXTreeNode
workflow is class SPWorkflow
root is class CBXTreeNode