title: In PHP, which is faster: preg_split or explode?
body: <p>Which is faster when using it to extract keywords in a search query in php:</p>
  <pre><code>$keyword = preg_split('/[\s]+/', $_GET['search']);
  </code></pre>
  <p>or</p>
  <pre><code>$keyword = explode(' ', $_GET['search']);
  </code></pre>