how to add odd/even loop in array

1. ount the loop number

for($i=0;$i<$blah;$i++)
   if($i&1){
     // ODD
   }else{
     // EVEN
   }

2. odd loop itteration

$oddLoop = false;
   foreach ($findposts as $findpost):
//.....
if($oddLoop=!$oddLoop){
  // code for odd loop numbers
}else{
  // code for even loop numbers
}

3. Odd ID number

 if ( ( $findpost->ID ) != $id ) {
    if($findpost->ID & 1){
       // ODD
    }else{
       //EVEN
    }

The three ways are

1. Modulo

for ($i = 0; $i < 10; $i++)
{
  if ($i % 2 == 0)
  {
    echo "even";
  }
  else
  {
    echo "odd";
  }
}

2. Flipping boolean value

$even = true;
for ($i = 0; $i < 10; $i++)
{
  if ($even)
  {
    echo "even";
  }
  else
  {
    echo "odd";
  }

  $even = !$even;
}

3. mentioned boolean operator

for ($i = 0; $i < 10; $i++)
{
  if ($i & 1 == 0)
  {
    echo "even";
  }
  else
  {
    echo "odd";
  }
}