The post loop is the part of the template that starts with something like:

while ($the_query->have_posts()) : $the_query->the_post();

and ends with:

< ?php endwhile; ?>

Regarding the database associated with the current post, it simply refers to the images that have been uploaded along with the current post. This information is stored in the database--you don't have to worry about that if it doesn't make sense to you.

Best of luck.

1. What exactly do you call “Post Loop”. I assume you refer to the single post template in the theme design. If you do, can you specify exactly where to insert this code?

2. What do you mean by “database associated with the current post”? Where is this database located?

Thanks a lot.

Thanks a lot.

http://codex.wordpress.org/Function_Reference/get_children
http://codex.wordpress.org/Function_Reference/wp_get_attachment_image_src

There’s more functions along similar lines. My revised function, to return the specified size (“full”, “medium”, “thumbnail”) of the image in the specified post or page, is as follows:

function getImage( $postID, $size = "thumbnail" ) {
    $images = get_children( "post_parent=$postID&post_type=attachment&post_mime_type=image" );
    if ( $images ) {
        foreach( $images as $image_id => $image_infos ) {
            $the_image = wp_get_attachment_image_src( $image_id, $size );
            if ( $the_image ) {
                return $the_image[0];
                break;
            }
        }
    }
    return "";
}

function getThumbnail( $postID, $size = "thumbnail" ) {
    global $wpdb;
    $image = "";
    $maxWidth = get_option( $size.'_size_w' );
    $post_attachments = $wpdb->get_results( "
        SELECT  guid
        FROM        $wpdb->posts
        WHERE       post_parent = $postID
        AND     post_type   = 'attachment'
        ORDER BY    post_date ASC
        LIMIT       0,1
    " );
    if ( $post_attachments ) {
        $sourceimage = $post_attachments[0]->guid;
        $sourceimage = str_replace( ".jpg", "", $sourceimage );
        $sourceimage = str_replace( ".png", "", $sourceimage );
        $sourceimage = str_replace( ".gif", "", $sourceimage );
        $sourceimage = str_replace( get_bloginfo( "siteurl" ), "", $sourceimage );
        $root = $_SERVER[ 'DOCUMENT_ROOT' ];
        foreach ( glob( "$root$sourceimage-*$maxWidth*" ) as $filename ) {
            $image = $filename;
            $image = str_replace( $root, "", $image );
        }
    }
    return $image;
}

It defaults to getting the thumbnail, or you can ask it to get the medium size, too. It dynamically gets the WP option for the relevant max width and matches on that.

This function works for my current set up – both thumbnail is set to 80 x 80 and medium is set to 150 x 150. The match allows the max width value found to be anywhere in the filename, i.e. it could end up matching the height of a thumbnail, if you have thumbnail at 80 x 150 and medium as 150 x 300, say. Not sure – please test for yourself before using, but hopefully this idea is of use to someone…

I’m trying to use this technique with the SEO Siloing plugin to draw my posts onto the page with thumbnails. I’m having trouble merging the two and would REALLY appreciate any help.