title: PHP: variables in strings without concatenation
body: <p>If I have a variable $var in this string:
  <code>echo "Hello, there are many $vars";</code></p>
  
  <p>Php looks for the <code>variable $vars</code> instead of <code>$var</code>.</p>
  
  <p>Without concatenation like: <code>"Hello, there are many $var" . "s";</code> 
  <br>is there another way to do this, like some sort of escaping character? </p>