$post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID' ) ) );
foreach ( $attachments as $k => $attachment ) {
if ( $attachment->ID == $post->ID )
break;
}
// If there is more than 1 image attachment in a gallery
if ( count( $attachments ) > 1 ) {
$k++;
if ( isset( $attachments[ $k ] ) )
// get the URL of the next image attachment
$next_attachment_url = get_attachment_link( $attachments[ $k ]->ID );
else
// or get the URL of the first image attachment
$next_attachment_url = get_attachment_link( $attachments[ 0 ]->ID );
} else {
// or, if there's only 1 image attachment, get the URL of the image
$next_attachment_url = wp_get_attachment_url();
}
?>
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