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<?php
/**
 * Alternate a given parameter depending on a looped element counts even or odd.
 * 
 * This would e.g. go somewhere inside the WordPress Loop.
 * 
 * 1. Set up counting.
 * 2. Determine whether current iteration counts odd or even.
 * 3. Set a default value for parameter to be alternated.
 * 4. Set up alternation.
 * 5. Conditionally set alternated value for parameter depending on odd/even status of iteration.
 */

while ( have_posts() ) : 
	the_post();

	// Count.
	$i = ! isset( $i ) ? 1 : $i;

	// Does this post count odd?
	$maybe_odd = $i % 2; // 1/0

	// Default parameter value.
	$param = 'right';

	// Alternated parameter value.
	$param_alt = 'right' === $param ? 'left' : 'right';

	// Does this post count even? If so, alternate param.
	if ( ! $maybe_odd ) {
		$param = $param_alt;
	}

	// Example: class attribute for post wrapper; 
	// alignright on odd, alignleft on even iteration.
	$class = "align$param";
	?>

	<article class="post">
		<figure class="featured-image <?php echo $class; ?>">
			<img src="http://dummyimage.com/200x200/000/fff&text=<?php echo $class; ?>" />
			<figcaption>This figure has a class of <code><?php echo $class; ?></code>.</figcaption>
		</figure>
	</article>

	<?php

	// Count up.
	$i++;

endwhile;