extract post image to be featured images

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I been working with featured images more lately and I been adding them to my posts as I go. However I have a bunch of older posts that do not have the featured image set and I want to use it for such things as wptouch etc.

So I have like 300 posts and to be honest I dont want to go into 300 posts and set the images manually.

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IS there anyway either by plugin or code that you can code it where the featured images area will grab the first image in each post?

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2 comments

  1. if the image is inserted (attached) into the post and not a external link:

    function get_my_thumbnail($post_id, $size, $attr = ''){

  // check of featured image first
  $t = get_post_thumbnail_id($post_id);

  // no featured image set, check post attachments
  if(empty($t)){
    $attachments = get_children(array(
      'post_parent'    => $post_id,
      'post_status'    => 'inherit',
      'post_type'      => 'attachment',
      'post_mime_type' => 'image',
      'order'          => 'ASC',
      'orderby'        => 'menu_order ID',
    ));
    $attachment = array_shift($attachments); // we only need one
    $t = $attachment ? $attachment->ID : false;
  } 

  // no attachments either...
  if(empty($t)) return 'no image...';

  // we have either attachment / featured image, so output the post thumbnail
  do_action('begin_fetch_post_thumbnail_html', $post_id, $t, $size); // compat
  $html = wp_get_attachment_image($t, $size, false, $attr);
  do_action('end_fetch_post_thumbnail_html', $post_id, $t, $size);

  return $html;
}

    You may want to also regenerate all attachment sizes (auto-create $size-d images from your older ones), so you don’t get browser-resized huge images…

  2. Here is the function:

    function catch_that_image() {
global $post, $posts;
$first_img = '';
ob_start();
ob_end_clean();
$output = preg_match_all('/<img.+src=['"]([^'"]+)['"].*>/i', $post->post_content, $matches);
$first_img = $matches [1] [0];

// no image found display default image instead
if(empty($first_img)){
    $first_img = get_bloginfo('template_url')."/images/no_image.gif";
}
return $first_img;
}

    and Here is how to use it:

    $imgURL = catch_that_image();