Perhaps this bug has been already fixed (I locked arround here and I
found a nearly similar bug depending Count() and Arrays, which was fixed fpr PHP4).

But I search now a longer time (5 months) for a reproduceable example cause the error happens only in very seldom situation.

<?php

class blubb {
        function bla () {
                $y[3][d]="D";
#               $y[xxx][]=$y[0][a];
                return($y);
        }

        function fasel () {
                $x=$this->bla();
                echo "Value is : '". $x[xxx][0] ."' and it is " .
                          ((isset($x[xxx][0]))?"":"not") ." set<br>";
                echo "Count is now ". Count($x[xxx]) ."<br>";
                echo "Value is : '". $x[xxx][0] ."' and it is ".
                          ((isset($x[xxx][0]))?"":"not") ." set<br>";
                echo "Count is now ".Count($x[xxx]) ."<br>";
        }
}

$z=new blubb;
$z->fasel();

?>

Output:
Value is : '' and it is not set
Count is now 1
Value is : '' and it is not set
Count is now 0

Strange, eh? The other way arround I would understand, but this
is unintelligible.