title: how to use preg_split() in php?
body: <p>Can anybody explain to me how to use preg_split() function?
  I didn't understand the pattern parameter like this <code>"/[\s,]+/"</code>.</p>
  
  <p>for example: </p>
  
  <p>I have this subject: <code>is is.</code> and I want the results to be:</p>
  
  <pre><code>array (
    0 =&gt; 'is',
    1 =&gt; 'is',
  )
  </code></pre>
  
  <p>so it will ignore the space and the full-stop, how I can do that?</p>