How do I refer a file in php which is ahead of two folders
<p>I have the following structure </p>

<pre><code>  folder1
    file1.php
    file2.php
 folder2
    folder2.1(folder)
       file2.1.1(file)
</code></pre>

<p>In the above structure how do I refer to file (file1.php) which in folder1 from file2.1.1.php  which is in folder2.1</p>
