title: Speed difference in using inline strings vs concatenation in php5?
body: <p>(assume php5) consider</p>
  
  <pre><code>&lt;?php
  
      $foo = 'some words';
  
      //case 1
      print "these are $foo";
  
      //case 2
      print "these are {$foo}";
  
      //case 3
      print 'these are ' . $foo;
  ?&gt;
  </code></pre>
  
  <p>Is there much of a difference between 1 and 2?</p>
  
  <p>If not, what about between 1/2 and 3?</p>