title: How efficient is define in PHP?
body: <p>C++ preprocessor <code>#define</code> is totally different.</p>
  
  <p>Is the PHP <code>define()</code> any different than just creating a var?</p>
  
  <pre><code>define("SETTING", 0);  
  $something = SETTING;
  </code></pre>
  
  <p>vs</p>
  
  <pre><code>$setting = 0;  
  $something = $setting;
  </code></pre>