php & operator construct
<p>I got this piece of code which I'm analysing and it have this condition</p>

<pre><code>if(($hint&amp;self::HINT_WRITE  &amp;&amp; $hint&amp;self::HINT_NOWRITE) || ($hint&amp;self::HINT_READ  &amp;&amp; $hint&amp;self::HINT_NOREAD))
{
    some code ..
}
</code></pre>

<p>Any Idea what '&amp;' in '$variable&amp;self::CONSTANT' means?</p>
