http_build_query turns not_var=yes into ¬_var=yes in some PHP configurations. Why?
<p>This code:</p>

<pre><code>$query = array(
    "var" =&gt; "no",
    "not_var" =&gt; "yes",
    "var2" =&gt; "maybe"
);
print http_build_query($query);
</code></pre>

<p>Outputs:</p>

<pre><code>var=no¬_var=yes&amp;var2=maybe
</code></pre>

<p>This happens on my own machine running PHP 5.3.19. I've reproduced this behavior on <a href="http://phpfiddle.org/main/code/s9y-ixg" rel="nofollow">PHPfiddle</a>. It works as expected on <a href="http://ideone.com/hx1NjX" rel="nofollow">ideone.com</a> running PHP 5.2.11.</p>

<p>Why does this happen?</p>
