Chèn vào file functions.php trong thư mục theme
Code:
// Note that your theme must support post thumbnails for this function to work.
// If you are getting an error try adding add_theme_support('post-thumbnails'); to your functions. php file
function vp_get_thumb_url($text, $size){
global $post;
$imageurl="";
// Check to see which image is set as "Featured Image"
$featuredimg = get_post_thumbnail_id($post->ID);
// Get source for featured image
$img_src = wp_get_attachment_image_src($featuredimg, $size);
// Set $imageurl to Featured Image
$imageurl=$img_src[0];
// If there is no "Featured Image" set, move on and get the first image attached to the post
if (!$imageurl) {
// Extract the thumbnail from the first attached imaged
$allimages =&get_children('post_type=attachment&post_mime_type=image&post_parent=' . $post->ID );
foreach ($allimages as $img){
$img_src = wp_get_attachment_image_src($img->ID, $size);
break;
}
// Set $imageurl to first attached image
$imageurl=$img_src[0];
}
// If there's no image attached or inserted in the post, look for a YouTube video
if (!$imageurl){
// look for traditional youtube.com url from address bar
preg_match("/([a-zA-Z0-9\-\_]+\.|)youtube\.com\/watch(\?v\=|\/v\/)([a-zA-Z0-9\-\_]{11})([^<\s]*)/", $text, $matches2);
$youtubeurl = $matches2[0];
if ($youtubeurl)
$imageurl = "http://i.ytimg.com/vi/{$matches2[3]}/1.jpg";
// look for YouTube embed
else preg_match("/([a-zA-Z0-9\-\_]+\.|)youtube\.com\/(v\/)([a-zA-Z0-9\-\_]{11})([^<\s]*)/", $text, $matches2);
$youtubeurl = $matches2[0];
if ($youtubeurl)
// Get the thumbnail YouTube automatically generates
// '0' is the biggest version, use 1 2 or 3 for smaller versions
$imageurl = "http://i.ytimg.com/vi/{$matches2[3]}/1.jpg";
}
// If there is no image attached to the post, look for anything that looks like an image and get that
if (!$imageurl) {
preg_match('/<\s*img [^\>]*src\s*=\s*[\""\']?([^\""\'>]*)/i' , $text, $matches);
$imageurl=$matches[1];
}
// If there is no youtube thumbnail, show a default image
if (!$imageurl) {
$imageurl= "http://killthebeat.com/wp-content/themes/buzznews/images/thumbz.jpg";
}
// Spit out the image path
return $imageurl;
}
