Here is a great way of determining if a value is even or odd, often times I use this function to color a table of data on every other line old school like the green and white line feed paper of my youth.
if( $i&1 ){ even } else{ odd }
or in a fun one liner like i’ve used it many times
$screen_file .= ( $i&1 ? “\t
\n\t
\n\t