/**
* Auto Generate Thumbnail for a Post from an Image in it.
*/
if ( function_exists( 'add_theme_support' ) ) {
add_theme_support( 'post-thumbnails' ); // This should be in your theme. But we add this here because this way we can have featured images before swicth to a theme that supports them.
function easy_add_thumbnail($post) {
$already_has_thumb = has_post_thumbnail();
$post_type = get_post_type( $post->ID );
$exclude_types = array('');
$exclude_types = apply_filters( 'eat_exclude_types', $exclude_types );
// do nothing if the post has already a featured image set
if ( $already_has_thumb ) {
return;
}
// do the job if the post is not from an excluded type
if ( ! in_array( $post_type, $exclude_types ) ) {
// get first attached image
$attached_image = get_children( "order=ASC&post_parent=$post->ID&post_type=attachment&post_mime_type=image&numberposts=1" );
if ( $attached_image ) {
$attachment_values = array_values( $attached_image );
// add attachment ID
add_post_meta( $post->ID, '_thumbnail_id', $attachment_values[0]->ID, true );
}
}
}
// set featured image before post is displayed (for old posts)
add_action('the_post', 'easy_add_thumbnail');
// hooks added to set the thumbnail when publishing too
add_action('new_to_publish', 'easy_add_thumbnail');
add_action('draft_to_publish', 'easy_add_thumbnail');
add_action('pending_to_publish', 'easy_add_thumbnail');
add_action('future_to_publish', 'easy_add_thumbnail');
}
.
