sklundy

Resolved. To make timthumb apply to the entirety of a post, use the following code:

<?php ob_start();
   the_content('Read the full post',true);

$postOutput= preg_replace('#<img(.*?)src="([^"]*/)?(([^"/]*)\.[^"]*)"([^>]*?)>#', '<a href=$2$3><img$1src="https://....timthumb.php?src=$2$3&w=476&h=275&zc=1&q=200"></a>', ob_get_contents());  

   ob_end_clean();
   echo $postOutput;
 ?>

Simply add a number as the fourth parameter in preg_replace().

For example, I’ve limited the following code (from the link you provided) to removing replacing ONCE:

$first_img = str_replace('https://yourwebsite.com', '', $first_img,1 );

You are dealing with the “limit” parameter.

See more here: