title: Extract and echo a URL parameter in WordPress
body: <p>On our WordPress site, I am linking from an email to a specific page.  Right now, an example of the link looks something like this: </p>
  
  <p>www.example.com/?firstName=Joe&amp;lastName=Smith&amp;amount=$3,000</p>
  
  <p>I would like to extract the parameters from the URL and echo them in different locations on the page.  For example, there is a paragraph that might say "Hi $firstName, you have been approved for $amount." </p>
  
  <p>How would I do this in WordPress? </p>