根据另一个变量的偶数/奇数状态更改变量？

Question

for($i=0;$i<$num;$i++) {
  if($i==even) $hilite="hilite";
  dothing($i,$hilite);
}

This is basically what I want to accomplish. What is the most efficient way to determine if $i is even? I know I could check if half == mod 2 ... but that seems a little excessive on the calculations? Is there a simpler way?

Answer 1

if ($i % 2 == 0)