title: Round integer to nearest multiple of 5 in PHP
body: <p>Searching for a function ro round numbers to the nearest multiple of 5</p>
  
  <pre><code>22 -&gt; 20
  23 -&gt; 25
  40 -&gt; 40
  46 -&gt; 45
  48 -&gt; 50
  </code></pre>
  
  <p>and so on.</p>
  
  <p>Tried this which always returns the higher value:</p>
  
  <pre><code>5 * ceil($n / 5);
  </code></pre>