Buongiorno (..mmazza quant'è tardi stamattina!)

Cosa fa REQUEST?
Quando scrivi "//mostri i soliti contenuti " intendevi il form?

Mi faresti l'esempio concreto?

La pagina del form è questa:
Codice PHP:
<div id="contactFormUsr">
    <form action="includes/contact_usr/send_mail_usr.php" method="POST">
        <div class="cfUsrBox">
            <div class="cfUsrTitle">
                Messaggio per
            </div>
            <div class="mmuuaUsrForm">
                <?php echo $u_art['mmuua'] ?>
            </div>
        </div>
        <div class="cfUsrBox">
            <div class="cfUsrTitle">
                Il tuo nome
            </div>
            <input type="text" name="nomemitt" class="lineCFUsr" />
        </div>
        <div class="cfUsrBox">
            <div class="cfUsrTitle">
                La tua e-mail
            </div>
            <input type="text" name="mailmitt" class="lineCFUsr" />
        </div>
        <div class="cfUsrBox">
            <div class="cfUsrTitle">
                Messaggio
            </div>
            <textarea name="messmitt" class="txtaCFUsr"></textarea>
        </div>
        <input type="hidden" name="mailaddress" value="<?php echo $u_usr['email'] ?>" />
        <input type="hidden" name="username" value="<?php echo $usr ?>" />
        <div id="submitFormUsr">
            <input type="submit" name="invia" value="Invia" rel="facebox">
        </div>
    </form>
</div>
Mentre la pagina dove punta il form è questa:
Codice PHP:
<?php

    include_once('../../phpclass/class.phpmailer.php');
    
    $mail = new PHPMailer();
    $mail->CharSet = 'UTF-8';
    
    $mail->From = $_POST['mailmitt'];
    $mail->FromName = $_POST['nomemitt'];
    $mail->Subject = "Mail service";
    $html_body = '
    <html>
        <body>
            Messaggio:

            '.$_POST['messmitt'].'
        </body>
    </html>
    ';
    
    $mail->MsgHTML($html_body);
    $mail->AddAddress($_POST['mailaddress']);
    $mail->Send();

    echo $_POST['mailmitt']."
";
    echo $_POST['nomemitt']."
";
    echo $_POST['messmitt']."
";
    echo $_POST['mailaddress'];
    
    header("Location: ../../?page=usr&u=".$_POST['username']);
    
?>
Dovrei fare così?:
Codice PHP:
<div id='tofacebox'>
<?php
    if(isset($_REQUEST[...])){


             include_once('../../phpclass/class.phpmailer.php');
    
    $mail = new PHPMailer();
    $mail->CharSet = 'UTF-8';
    
    $mail->From = $_POST['mailmitt'];
    $mail->FromName = $_POST['nomemitt'];
    $mail->Subject = "Mail service";
    $html_body = '
    <html>
        <body>
            Messaggio:

            '.$_POST['messmitt'].'
        </body>
    </html>
    ';
    
    $mail->MsgHTML($html_body);
    $mail->AddAddress($_POST['mailaddress']);
    $mail->Send();

    echo $_POST['mailmitt']."
";
    echo $_POST['nomemitt']."
";
    echo $_POST['messmitt']."
";
    echo $_POST['mailaddress'];
    
    header("Location: ../../?page=usr&u=".$_POST['username']);


    }
    else{


        <div id="contactFormUsr">
    <form action="includes/contact_usr/send_mail_usr.php" method="POST">
        <div class="cfUsrBox">
            <div class="cfUsrTitle">
                Messaggio per
            </div>
            <div class="mmuuaUsrForm">
                <?php echo $u_art['mmuua'] ?>
            </div>
        </div>
        <div class="cfUsrBox">
            <div class="cfUsrTitle">
                Il tuo nome
            </div>
            <input type="text" name="nomemitt" class="lineCFUsr" />
        </div>
        <div class="cfUsrBox">
            <div class="cfUsrTitle">
                La tua e-mail
            </div>
            <input type="text" name="mailmitt" class="lineCFUsr" />
        </div>
        <div class="cfUsrBox">
            <div class="cfUsrTitle">
                Messaggio
            </div>
            <textarea name="messmitt" class="txtaCFUsr"></textarea>
        </div>
        <input type="hidden" name="mailaddress" value="<?php echo $u_usr['email'] ?>" />
        <input type="hidden" name="username" value="<?php echo $usr ?>" />
        <div id="submitFormUsr">
            <input type="submit" name="invia" value="Invia" rel="facebox">
        </div>
    </form>
</div>


    }
?>
</div>
E' giusto come ho fatto? ...ma in REQUEST cosa ci va?