Description:
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the Operator % (modular division) return a erroneous result.

Reproduce code:
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 $a = 63522;
 $b = 62186;
 echo "a = 63522\n";
 echo "b = 62186\n";
 echo $num."\n";
 $mod = ($a*$b) % 65536;
 echo "mod = $mod";


Expected result:
----------------
 $a = 63522;
 $b = 62186;
 $num = $a*$b;
 echo $num."\n";
 $p = $num/65536;
 echo (int)$p."\n";
 $num = $num-((int)$p*65536);
 echo "re-mod = $num";