To Create WORD FILE and write in it in PHP

Below code is to create WORD file and then write in it. Its simple form, and value entered in Textbox will be written in WORD file.

<?
if($_POST)
{   
    $fp = fopen("test.doc", 'w+');
    $str = "First Name: " .$_POST['fname']."\n";
    $str .= "Middle Name: " .$_POST['mname']."\n";
    $str .= "Last Name: " .$_POST['lname']."\n";
    fwrite($fp, $str);
    fclose($fp);
}
?>

<form method="post">
First Name : <input type="text" name="fname"><br />
Middle Name : <input type="text" name="mname"><br />
Last Name : <input type="text" name="lname"><br />
<input type="submit" name="submit">
</form>