retrieve wordpress featured image (thumbnail) programmatically

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HI I am using wordpress v3.03 and I am wondering how do I get featured images for the post in my theme

Currently I am using

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get_the_post_thumbnail( $post->ID, 'post-thumbnail')

and it worked fine with 1 images, but when i kept add new images the above code always retrieve the first image i attached to the post instead of the image i set as “featured”

any help will be appreciated

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  1. In you’re theme functions.php file add

    add_theme_support( 'post-thumbnails' );
add_theme_support( 'post-thumbnails', array( 'post' ) );

    Then in wp-admin when you edit a post you should have a featured image box where you can set 1 featured image . Then in the loop you can use the following functions :

    the_post_thumbnail();
has_post_thumbnail();

    Update

    After you added post-thumbnails theme support , you need to set the featured image using the “featured image” box on the right sidebar on wp-admin/post.php page . It’s right under the “post tags” box . Then outside the loop you can use get_the_post_thumbnail() function to retrive that image . If you didn’t set any featured image for the post it will fetch the last image you inserted in that post .

    One other way to set the featured image would be ( after you added post-thumbnail theme support ) , is when you insert an image into the post you will have a “set featured image” after you uploaded ( on the modal that let’s you select image alignment ) . Then the image should be visible on the right sidebar “featured image” box .

  2. // Gets the post's featured image URL, if not available then use given fallback url.
function get_featured_image_url($fallback_url) {
  if (is_front_page()) {
    return $fallback_url;
  }

  $thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'large');

  if (!$thumb) {
    return $fallback_url;
  }

  return $thumb[0];
}