title: Single quotes or double quotes for variable concatenation?
body: <p>Is it better to concatenate a variable (say, <code>$name</code>) into an existing string (say, <code>$string</code>) like this:</p>
  
  <pre><code>$string='Hi, my name is '.$name
  </code></pre>
  
  <p>or to embed the variable in the string like this:</p>
  
  <pre><code>$string="Hi, my name is $name";
  </code></pre>
  
  <p>or is it better to use a function like this:</p>
  
  <pre><code>$string=sprintf("Hi, my name is %s",$name);
  </code></pre>
  
  <p>Which is better in terms of processor time/efficiency?</p>