Whats the error in my php function?
<p>I have a function a. That is re used in many times without any problem. But now  i cant call the function.<strong>This is my function</strong></p>

<pre><code>function a($a,&amp;$b){
        // functions code here
        }
</code></pre>

<p>I calling function a like this.</p>

<pre><code>a(3,null);
</code></pre>

<p>Whats the error with my code?</p>
