How can I add a conditional to show a default image when a post has no featured?

Something like this?

<?php
if ( has_post_thumbnail()) {
 echo '<img src="post/thumbnail/path" alt="post thumb">';
} else {
 echo '<img src="default/thumbnail/path" alt="Default Thumb">';
}
?>

Evan

This is what was in the theme. How can I rework this to include your code?

<div id="next-prev-posts">
			<?php $prevPost = get_previous_post(); $prevthumbnail = get_the_post_thumbnail($prevPost->ID, array(100,100) ); ?>
			<?php $nextPost = get_next_post(); $nextthumbnail = get_the_post_thumbnail($nextPost->ID, array(100,100) ); ?>

			<div class="inner">
				<div class="nav-next">
					<?php if ($nextPost) { ?>
					<?php next_post_link('%link',"$nextthumbnail", false); ?>
					<?php next_post_link('%link', '<span class="meta-nav">?</span> %title', false) ?>
					<?php } else { echo "<p>You're at the beginning!</p>"; } ?>
				</div>
				<div class="nav-previous">
					<?php if ($prevPost) { ?>
					<?php previous_post_link('%link', '%title <span class="meta-nav">?</span>', false) ?>
					<?php previous_post_link('%link',"$prevthumbnail", false); ?>
					<?php } else { echo "<p>You're at the end!</p>"; } ?>
				</div>
			</div>
		</div>

Possibly something like this?

You may need to tweak/adjust it.

<div id="next-prev-posts">
			<?php $prevPost = get_previous_post(); $prevthumbnail_img = get_the_post_thumbnail($prevPost->ID, array(100,100) ); ?>
			<?php $nextPost = get_next_post(); $nextthumbnail_img = get_the_post_thumbnail($nextPost->ID, array(100,100) ); ?>

			<?php $default_post_thumb = '<img src="default/thumbnail/path" alt="Default Thumb">';

				/* Previous Thumbnail */
				if ( $prevthumbnail_img() ) {
					$prevthumbnail = $prevthumbnail_img;
				} else {
					$prevthumbnail = $default_post_thumb;
				}

				/* Next Thumbnail */
				if ( $nextthumbnail_img() ) {
				  $nextthumbnail = $nextthumbnail_img;
				} else {
					$nextthumbnail = $default_post_thumb;
				}

			?>	

			<div class="inner">
				<div class="nav-next">
					<?php if ($nextPost) { ?>
					<?php next_post_link('%link',"$nextthumbnail", false); ?>
					<?php next_post_link('%link', '<span class="meta-nav">?</span> %title', false) ?>
					<?php } else { echo "<p>You're at the beginning!</p>"; } ?>
				</div>
				<div class="nav-previous">
					<?php if ($prevPost) { ?>
					<?php previous_post_link('%link', '%title <span class="meta-nav">?</span>', false) ?>
					<?php previous_post_link('%link',"$prevthumbnail", false); ?>
					<?php } else { echo "<p>You're at the end!</p>"; } ?>
				</div>
			</div>
		</div>

Thanks, Evan. Just one question, how would I format this line? I’m linking to the image from a child theme but this line is giving out an error. I’m not too good with PHP and I’m sure I’m not allowed to open a php statement when one’s already open.

echo '<img src="<?php echo dirname( get_bloginfo('stylesheet_url') ); ?>/images/isa.jpg" alt="ISA">';

Ok, I figured out that I can concatenate it like this:

echo '<img src="'.get_stylesheet_directory_uri().'/images/isa.jpg" alt="ISA" />';

But now I’m getting an undefined function error on this line:

if ( $prevthumbnail() ) {

Ok, never mind I figured that out too. It should be if ( $prevthumbnail ) {.

Sorry I didn’t get back to you sooner. Glad you were able to figure that out on your own. Happy coding!