where is the submit value from in this form?
<p>I got this script:</p>

<pre><code>&lt;?php
if (!isset($_POST) || empty($_POST)) {
    ?&gt;
    &lt;form name="form1" method="post" action=""&gt;
        &lt;input type="text" name="textfield"&gt;&lt;br /&gt;
        &lt;input type="submit" name="Submit" value="Submit"&gt;
    &lt;/form&gt;
    &lt;?php
} else {
    $roughHTTPPOST = readfile("php://input");
    echo $roughHTTPPOST;
}
?&gt;
</code></pre>

<p>Every time I submit the form I get a string contain both textfield and Submit value, the textfield value is pretty simple and straighforward. However I don't know where te Submit value come from?
Here is a sample string return when I enter "a" character and submit form:</p>

<blockquote>
  <p>textfield=a&amp;Submit=Submit25
  P/S: What I mean here is the value <strong>25</strong> appended after 'Submit', where does it come from, the textfield value is easy to understand.</p>
</blockquote>
