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I want to show thumbnails next to my posts in archive page, however it only shows thumbnails if the posts has a featured image.

So I want to show thumbnail for the image attached to the post, but I don't know how to.

At the moment I am using the following code to show thumbnails if set as featured.

<?php if ( has_post_thumbnail()) : ?>
   <a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>" >
   <?php the_post_thumbnail(thumbnail, array('class' => 'alignleft')); ?>
<?php endif; ?>

Any suggestions are appreciated

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possible duplicate: wordpress.stackexchange.com/q/57476/10691 — actually a search on WPSE should help you out. :) – its_me Jul 14 '12 at 17:45

You can check if the post as a thumbnail and if not the get the first image in the post ex:

$size = 'thumbnail';
if ( has_post_thumbnail() ) {
    <a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>" >
        <?php the_post_thumbnail($size, array('class' => 'alignleft')); ?>

} else {
    $attachments = get_children( array(
        'post_parent' => get_the_ID(),
        'post_status' => 'inherit',
        'post_type' => 'attachment',
        'post_mime_type' => 'image',
        'order' => 'ASC',
        'orderby' => 'menu_order ID',
        'numberposts' => 1)
    foreach ( $attachments as $thumb_id => $attachment ){ //this was missing
        <a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>" >
        <?php echo wp_get_attachment_image($thumb_id, $size); ?>
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