Empty POST Array

$SendMail = ''; 

if (isset($_POST['testtext'])) { 

$SendMail .= <<<MAILRESPONSE 

<h3>Mail Response Here</h3> 

MAILRESPONSE; 
} 

$SendMail .= <<<MAILFORM 

<form method="POST" name="ecpemailform" id="ecpform" action="[~[*id*]~]"> 
    <input type="text" name="testtext" /> 
    <input type="submit" value="Send this Message" /> 
</form> 

MAILFORM; 
return $SendMail; 

var_dump($_POST);