passing empty query string to php
<p>i have question for query string</p>

<p>i have page wehere i pass query string like that</p>

<pre><code>      abc.php?id=12
</code></pre>

<p>some time query sting "id" is not passed like</p>

<pre><code>      abc.php
</code></pre>

<p>and some time value of id is empty</p>

<pre><code>     abc.php?id=
</code></pre>

<p>and in the above 2 possibilities pages gives error.</p>

<p>how to fix this ?</p>
