title: Match exact word is available or not in string in php
body: <p>I have below string i want to exact word is available or not in php
  Example</p>
  <pre><code>$String = 'http://www.testurl.com/article/test.php';
  $word = '/article/';
  </code></pre>
  <p>Now i want to check <code>'/article/'</code> is available or not in string, if the word is not contain start start and end slash then it should be return false.</p>