PHP Classes calling functions to it
<p>I saw some codes that when they call php functions from another class they no longer use <code>$this-&gt;functionName()</code>, 
they just refer immedietly to the function name, like <code>functionName()</code></p>

<p>In my index.php</p>

<pre><code> $help = new Helper();
 $help-&gt;Test();
</code></pre>

<p>I wanted to call Test Function by not doing the <code>$help</code>.</p>

<p>How can this be done? Why is this possible?</p>
