check if one value exists in an array
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/2440506/how-to-check-if-an-array-value-exists">How to check if an array value exists</a>  </p>
</blockquote>



<p>I have a problem in PHP. So, my problem is that I want to see if a particular value exists in a session (in which session I store an array). And if this value exists to return me a boolean ($check=TRUE). But when I try to stop the script with die (var_dump($check)); in  order to check the value, I get always this notice: </p>

<blockquote>
  <p>Undefined variable check...</p>
</blockquote>

<p>This is my code:</p>

<pre><code> $individualitem[] = $_SESSION["books"] ;

          foreach ($individualitem as $key =&gt; $idividualvalue){
            if($individualitem == $card){
                $check = TRUE;
            }     
         }  
     // die (var_dump($check));
</code></pre>
