Trying to detect thumbnail photos and create thumbnails using php.

I am creating a real estate website and in my listings I am trying to have php detect whether or not a thumbnail of the listing exists and if it doesn't create one. If the origninal image doesn't exist that we want to make a thumbnail of then we just put a generic "no image" picture up. I have code that I created but it doesn't work. I am hoping someone can help fix my code or give me suggestions / code snippets for an already working / developed code that does what I want. The code follows:

while ($search_array = mysql_fetch_array($search_result)){
	
	//Determine what type of property 
	if($search_array['property_type'] == 'R'){
		$property_type = 'Residential';
	}
	
	if($search_array['property_type'] == 'F'){
		$property_type = 'Farm';
	}
	
	//Look for a picture matching the criteria in the thumbnail area. -- Criteria = MLS Number _ 0*
	//foreach(glob("images/property_images/thumbs/".$search_array['mls_id']."_0*") as $image_thumb_filename);
	$image_thumb_filename = "images/property_images/thumbs/".$search_array['mls_id']."_0.jpg";
 
	//If photo exist then pull reference. If not move on..
	if(file_exists($image_thumb_filename)){
	$listing_image = $image_thumb_filename;
	}
 
	//Look for a picture matching the criteria again this time inside the main picture area.
	//foreach(glob("images/property_images/".$search_array['mls_id']."_0*") as $image_filename);
	$image_filename = "images/property_images/".$search_array['mls_id']."_0.jpg";
	//If a photo exist
	if((file_exists($image_filename)) And (file_exists($image_thumb_filename)==False)){
 
	// Set a maximum height and width
	$width = 140;
	$height = 105;
	
	// Content type
	header('Content-type: image/jpeg');
 
	// Get new dimensions
	list($width_orig, $height_orig) = getimagesize($image_filename);
 
	$ratio_orig = $width_orig/$height_orig;
 
	if ($width/$height > $ratio_orig) {
		$width = $height*$ratio_orig;
	} else {
		$height = $width/$ratio_orig;
	}
 
	$short_name=substr($image_filename,strrpos($image_filename,'/')+1);
 
	// Resample
	$image_p = imagecreatetruecolor($width, $height);
	$image = imagecreatefromjpeg($image_filename);
	imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
 
	$thumb_image_directory = "images/property_images/thumbs/";
	// Output
	imagejpeg($image_p, $thumb_image_directory);
 
	$listing_image = $thumb_image_directory.$short_name;
	}
 
	if(($image_filename == False) && ($image_thumb_filename == False)){
	$listing_image = $thumb_image_directory.'NoPhoto_140x105.png';
	}

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