title: Round up to nearest multiple of five in PHP
body: <p>I want a php function which returns 55 when calling it with 52.</p>
  
  <p>I've tried the <code>round()</code> function: </p>
  
  <pre><code>echo round(94, -1); // 90
  </code></pre>
  
  <p>It returns <em>90</em> but I want <em>95</em>.</p>
  
  <p>Thanks.</p>