parse & as part of variable in php
<p>I have this:</p>

<pre><code>mysite.com/index.php?refferer=http://www.refferersite.com/index.php?var1=a&amp;var2=b
</code></pre>

<p>this</p>

<pre><code>http://www.refferersite.com/index.php?var1=a&amp;var2=b
</code></pre>

<p>Will become this:</p>

<pre><code>http://www.refferersite.com/index.php?var1=a
</code></pre>

<p>How can I fix this?</p>
