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Simple WordPress thumbnail function

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  1. function vp_get_thumb_url($text)
  2. {
  3.   global $post;
  4.  
  5.   $imageurl="";        
  6.  
  7.   // extract the thumbnail from attached imaged
  8.   $allimages =&get_children('post_type=attachment&post_mime_type=image&post_parent=' . $post->ID );        
  9.  
  10.   foreach ($allimages as $img){                
  11.      $img_src = wp_get_attachment_image_src($img->ID);
  12.      break;                       
  13.   }
  14.  
  15.   $imageurl=$img_src[0];
  16.  
  17.  
  18.   // try to get any image
  19.   if (!$imageurl)
  20.   {
  21.     preg_match('/<\s*img [^\>]*src\s*=\s*[\""\']?([^\""\'>]*)/i' ,  $text, $matches);
  22.     $imageurl=$matches[1];
  23.   }
  24.  
  25.   // try to get youtube video thumbnail
  26.   if (!$imageurl)
  27.   {
  28.     preg_match("/([a-zA-Z0-9\-\_]+\.|)youtube\.com\/watch(\?v\=|\/v\/)([a-zA-Z0-9\-\_]{11})([^<\s]*)/", $text, $matches2);
  29.  
  30.     $youtubeurl = $matches2[0];
  31.     if ($youtubeurl)
  32.      $imageurl = "http://i.ytimg.com/vi/{$matches2[3]}/1.jpg"; 
  33.    else preg_match("/([a-zA-Z0-9\-\_]+\.|)youtube\.com\/(v\/)([a-zA-Z0-9\-\_]{11})([^<\s]*)/", $text, $matches2);
  34.  
  35.    $youtubeurl = $matches2[0];
  36.    if ($youtubeurl)
  37.      $imageurl = "http://i.ytimg.com/vi/{$matches2[3]}/1.jpg"; 
  38.   }
  39.  
  40.  
  41. return $imageurl;
  42. }
  43.  
  44. //Use
  45.   global $post;
  46.   $thumb=vp_get_thumb_url($post->post_content); 
  47.   if ($thumb!='') echo '<img style=" width:150px;" src="'.$thumb.'" alt="'. get_the_title().'" />

URL: http://www.prelovac.com/vladimir/simple-wordpress-thumbnail-function

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