run the code only once in php
<p>I need to run the program only once afterwards it will run another program.how is it possible </p>

<pre><code>    if()
{
include 'first.php';
}
else
{
include 'second.php';
}
</code></pre>

<p>I don't want to put conditions in the if condition 
plz any one help</p>
