Recently, I needed to use a programming trick to make a for loop alternate every other time. This can be done using a little trick called “zebra striping.”
It’s simple, set a variable to zero before the loop, then within the loop run the variable through an equation of 1 – variable. This will effectively make the loop either a zero or one every time the loop is run. See example code below…
<?php
$alt = 0;
for($i = 0; $i < 20; $i++) {
// do some stuff here
$alt = 1 - $alt;
}
?>
Just thought I’d share a helpful little snippet.