title: PHP round and PHP_ROUND_HALF_UP related issue
body: <p>I have a number string with the following number : </p>
  
  <pre><code>$str=14.5;
  </code></pre>
  
  <p>I want to half up this value so that I get </p>
  
  <pre><code>15 
  </code></pre>
  
  <p>I have tried this code </p>
  
  <pre><code> echo round($str,0,PHP_ROUND_HALF_UP); 
  </code></pre>
  
  <p>But It doesn't work and I am getting errors : </p>
  
  <pre><code> Use of undefined constants "PHP_ROUND_HALF_UP" , "Wrong parameter count for round" 
  </code></pre>