$_GET automatically adding '_' to variable name? : <p>I am checking whether a record exists in database or not</p>

<pre><code>if ($row["count(*)"] == 0) {
    header('Location: first.php? stat = "not found"');
}
</code></pre>

<p>Now, to check the stat variable in first.php, I am doing - </p>

<pre><code>print_r($_GET);
</code></pre>

<p>Output to this is -</p>

<pre><code>Array ( [stat_] =&gt; "not found" ) 
</code></pre>

<p>I dont understand how 'stat' variable became 'stat_' variable ?</p>
