Word press conditional statement

Word press conditional statement


recently i read about conditional from this blog

http://vanweerd.com/how-to-add-feat...ss-posts-and-pages-the-easy-way/#insert_image

please read this "Insert featured images as thumbnails in your post or page content"
and code is

function InsertFeaturedImage($content) {
 
global $post;
 
$original_content = $content;
 
    if ( current_theme_supports( 'post-thumbnails' ) ) {
 
        if ((is_page()) || (is_single())) {
            $content = the_post_thumbnail('page-single');
            $content .= $original_content;
            } else {
            $content = the_post_thumbnail('index-categories');
            $content .= $original_content;
        }
 
    }
    return $content;
}
 
add_filter( 'the_content', 'InsertFeaturedImage' );

PHP:

i studied this code for thumbnail not shown in full post .... is there any conditional code like "only after readmore content shown" in full post

 

This line restricts it to single posts and pages.
if ((is_page()) || (is_single())) {

Is that what you mean? Where do you need the thumbnails to show up?