Description:
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I have a function which is used to assign values into a number of global arrays. Two of the arrays are assigned values that are generated using the rand() function. A third array holds the result of the multiplication. When both first two arrays are assigned a value of 0 (zero), the result of the multiplication is 1 and not 0.

This information is then entered into a html form and presented to the user and they are asked to enter the results of 

$numfacttest[$a] / $randval[$a] = useranswer

The useranswer is then compared to $answer[$a] which is already calculated. The problem is that 0 * 0 is returning the answer 1 sometimes.

Reproduce code:
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function setnumberfacttest($count,$maxnumberfacts) {
   global $numfacttest, $answer, $operator, $randval;
   for ($a=0 ; $a < $count ; $a++) {
       $operator[a]=chr(247);
       $bit1=rand(0,$maxnumberfacts);
       $bit2=rand(0,$maxnumberfacts);
       $numfacttest[$a]=$bit1 * $bit2;
       $randval[$a]=$bit2;
       $answer[$a]=$bit1;
   }

}

Expected result:
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Actual Results with hidden value displayed

2 / 1 = <useranswer> 2
0 / 0 = <useranswer> 0
0 / 0 = <useranswer> 0
2 / 2 = <useranswer> 1
4 / 2 = <useranswer> 2
1 / 1 = <useranswer> 1
0 / 0 = <useranswer> 0
0 / 0 = <useranswer> 0
0 / 0 = <useranswer> 0
1 / 1 = <useranswer> 1


Actual result:
--------------
Actual Results with calculated hidden value displayed

2 / 1 = <useranswer> 2
0 / 0 = <useranswer> 1
0 / 0 = <useranswer> 0
2 / 2 = <useranswer> 1
4 / 2 = <useranswer> 2
1 / 1 = <useranswer> 1
0 / 0 = <useranswer> 1
0 / 0 = <useranswer> 0
0 / 0 = <useranswer> 2
1 / 1 = <useranswer> 1