title: Wrong output in php program
body: <p>Following is my code here actually o/p should be hi..but it is giving no     </p>
  
  <pre><code>&lt;?php
  
      $arr=array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');
      $c='xyz,ccc';
  
      if(in_array(isset($c) &amp;&amp; $c,$arr))
      {
          echo 'hi';
      }
      else 
      {
          echo 'no';
      }
  
  ?&gt;
  </code></pre>
  
  <p>output:hi</p>
  
  <p>actual result should be 'no'.</p>