$image = "";
$broad_img1= "";
//this has to be set like this as if file exist does not work with absolute paths
$path= 'http://wwwyour web site.com';
//this is the directory where the images are stored
$web_image_folder = 'image/thumbs';
$exts = array('jpg', 'png', 'gif', 'jpeg');
//the name of the file on the server
$image_name = 'thumb_image1';
 
 
// check for each extension
foreach($exts as $ext) {
   if (file_exists($web_image_folder.'/'.$image_name.'.'.$ext)) {
     $image = $image_name.'.'.$ext;
   }
}
 
// check if we have an image
if ($image != "") {
    // ok we have the image now store it in a variable
    $broad_img1='<img src="' . $path."/".$web_image_folder."/".$image . '" />';
} else {
    // error, we can't find the image.
}