Making post images show up automatically in a theme

If you’re interested in building a theme that use images automatically in the posts, you might find this code snippet useful. This will allow a thumbnail image to show up automatically without require the writer to insert any code in the post:

<?php # get the thumbnail image if one exists
  $image = "";
  $post_attachments = $wpdb->get_results("SELECT guid "
                                  ."FROM $wpdb->posts "
                                  ."WHERE post_parent = '$post->ID' "
                                  ."AND post_type = 'attachment' "
                                  ."ORDER BY <code>post_date</code> ASC "
                                  ."LIMIT 0,1"
                                  );

  if ($post_attachments) {
    $image = $post_attachments[0]->guid;
    $image = str_replace(".jpg","-64x64.jpg",$image);
    $image = str_replace(".png","-64x64.png",$image);
    $image = str_replace(".gif","-64x64.gif",$image);
  }
?>

<?php if ( $image != "" ) { ?>
    # Do something with the $image
<? } ?>

I’ve posted a few more details in case you’re interested here:

https://www.185vfx.com/2008/10/automatically-display-images-in-wordpress-themes/