function lm_add_feature_image_to_rss($content)
{
global $post;
$img_id = false;
// From post meta, custom field
$key = apply_filters("rss_image_meta_key", "blog-image");
if ($key && ($i = get_post_meta(get_the_ID(), $key, true))) {
$img_id = image_get_attachment_id($i);
}
// Fall back to featured image
if (!$img_id) {
$img_id = get_post_thumbnail_id();
}
// Fall back to first image from post content
if (!$img_id && ($i = auto_archive_image())) {
if ($i) {
$img_id = image_get_attachment_id($i);
}
}
// If we have an image URL, attach it
if ($img_id) {
$full_size = smart_media_size((int) $img_id, has_image_size('rssfeed-landscape') ? 'rssfeed-landscape' : 'medium');
$type = 'image/jpg';
if (substr($full_size, -3) == 'png') {
$type = 'image/png';
}
echo "\t";
echo sprintf('<media:content url="%s" medium="image" width="560" height="280" type="%s" />', esc_attr($full_size), esc_attr($type));
echo "\n";
}
}
function auto_archive_image($post_id = false, $size = 'thumbnail')
{
if (!$post_id) {
$post_id = get_the_ID();
}
if (!$post_id) {
return false;
}
// Use featured image if provided
$featured = get_the_post_thumbnail($post_id, $size);
if ($featured) {
return $featured[0];
}
// Look for an image in post meta. Meta key can be customized via filter or directly.
$meta_key = apply_filters('ld-archive-thumbnail-meta-key', 'featured-image', $post_id, $size);
if ($meta_key) {
$meta_thumbnail = get_post_meta($post_id, $meta_key, true);
if ($meta_thumbnail) {
$img = false;
if (is_numeric($meta_thumbnail)) {
// Attachment ID
$img = smart_media_size((int) $meta_thumbnail, $size);
} else {
if (is_string($meta_thumbnail)) {
// Image URL
$img = smart_media_size((string) $meta_thumbnail, $size);
}
}
if ($img) {
return $img;
}
}
}
// If we have already detected one through content before, use the cached version.
$meta_thumbnail = get_post_meta($post_id, 'lm_thumbnail', true);
if ($meta_thumbnail) {
$img = smart_media_size((string) $meta_thumbnail, $size);
if ($img) {
return $img;
}
}
// In case we have looked before but didn't find anything
if ($meta_thumbnail === 0) {
return false;
}
// We're going to scrape the post content and look for an image. We'll store it in lm_thumbnail if we find it so we don't have to scrape in the future.
global $post;
if ($post->ID == $post_id) {
$content = $post->post_content;
// Looks for an image, roughly checking if it is on this website
// Regex looks like: <img*src=*(__frequentflyeracademy.com__)*
if (!preg_match('/<img.*?src=[\'\\"](.*?' . $_SERVER['HTTP_HOST'] . '.*?)[\'\\"].*?>/i', $content, $matches)) {
return false;
}
$attachment_id = image_get_attachment_id($matches[1]);
if ($attachment_id) {
// Attachment ID was found, return the thumbnail
$attachment = wp_get_attachment_image_src($attachment_id, $size);
if ($attachment) {
$attachment_src = sprintf('<img src="%s" alt="%s - Featured Image" width="%s" height="%s" />', $attachment[0], esc_attr(get_the_title()), $attachment[1], $attachment[2]);
update_post_meta($post_id, 'lm_thumbnail', $attachment_src);
return $attachment_src;
}
}
// No attachment found, cannot use a thumbnail. Return the full size image.
$default_src = sprintf('<img src="%s" alt="%s - Featured Image" />', $matches[1], esc_attr(get_the_title()));
update_post_meta($post_id, 'lm_thumbnail', $default_src);
return $default_src;
}
update_post_meta($post_id, 'lm_thumbnail', 0);
return false;
}
