Hello,
please help with the following PHP form.

Here is the Link to form:
http://webmalerin.com/ideal-transpor...mber-mini1.php

- How can I handle user input (input fields), multiply with arrays?
- Multiply by user input, using the following example:
Example of the form, the user enters data into the form below:
1 sofa, 1 rocking chair, 6 chairs
Calculation: 1 RE = 1 X 1 bed room units total
1 rocking chair X 8 RE = 8 total room units
6 chairs X 2 RE = 12 total space units

Here is the code to my form:

PHP Code:
<?php
error_reporting
(E_ALL);
// define ('MAILTO', ""); // Empfänger hier eintragen
define ('MAILTO'""); // Empfänger hier eintragen
define ('MAILFROM'""); // ggfls. Absender hier eintragen
define ('CHARSET''Content-Type: text/html; charset=utf-8'); // Zeichenkodierung ggfls. anpassen
$Pflichtfelder = array('eMail'); //  Pflichtfelder

$AddHeader "";
$mailversendet false;

// $AddHeader = 'Content-Type: text/plain; charset='.CHARSET;
if(MAILFROM)
{
  
// $AddHeader .= chr(13).chr(10).'From: '.MAILFROM;
  
$AddHeader 'From: '.MAILFROM "\r\n" .
    
'Reply-To: '.MAILFROM "\r\n" .
    
'X-Mailer: PHP/' phpversion();
}

// $AddHeader  = 'MIME-Version: 1.0' . "\r\n";

if($Formular_abgeschickt = !empty($_POST)) {
  
$Formular_leer trueset_magic_quotes_runtime(0);
  
$_POST array_map('Formular_Daten'$_POST);
}
function 
Formular_Daten($val) {
  global 
$Formular_leer;
  if(
is_array($val)) return array_map('Formular_Daten'$val);
  if(
get_magic_quotes_gpc()) $val stripslashes($val);
  if(
$val trim($val)) $Formular_leer false;
  return 
$val;
}

function 
Formular_Pflichtfelder() {
  global 
$Pflichtfelder;
  
$Fehler '';
  foreach (
$Pflichtfelder as $Feld) {
    
$key str_replace(' ','_',$Feld);
    if(!(isset(
$_POST[$key]) && trim($_POST[$key]))) {
      if(
$Fehler$Fehler .= '<br />';
      
$Fehler .= 'Pflichtfeld "' $Feld '" nicht ausgefüllt.';
    }
  }
  return 
$Fehler;
}

function 
Formular_neu($log='.htPOSTdata.txt') {
  if(
file_exists($log) && is_readable($log)
   && 
file_get_contents($log) == print_r($_POST,true))
  return 
false;
  if(
$handle=@fopen($log'w')) {
    
fwrite($handleprint_r($_POST,true)); fclose($handle);
  }
  return 
true;
}

function 
Formular_Check() {
  global 
$Formular_leer;
  if(
$Formular_leer$Fehler 'Keine Daten eingetragen.';
  elseif(!
$Fehler Formular_Pflichtfelder()) {
    if(!
Formular_neu()) $Fehler 'Nachricht war bereits verschickt.';
    elseif(!
checkEmail($_POST['eMail'])) $Fehler 'E-Mail fehlerhaft.';
  }
  return 
$Fehler;
}

function 
Formular_Eingabe($Feldname$def='') {
  if(!empty(
$_POST[$Feldname])) echo htmlspecialchars($_POST[$Feldname]);
  else echo 
$def;
}



function 
checkEmail($adr) {
  
$regEx '^([^\s@,:"<>]+)@([^\s@,:"<>]+\.[^\s@,:"<>.\d]{2,}|(\d{1,3}\.){3}\d{1,3})$';
  return (
preg_match("/$regEx/",$adr,$part)) ? $part false;
}



function 
anfragetext($_POST) {
    foreach (
$_POST AS $feldname => $felderinhalt)
    {
        
$ausgabe .= strtoupper($feldname) . ": "$felderinhalt ."\r\n";
    }
    
$ausgabe .= "\r\n\r\nAnfrage wurde per Website erstellt am: "date("H:i d.m.Y");
    return (
$ausgabe);
}


?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
<head>
  <title>Anmeldeformular</title>
</head>
<body>





<?php
if($Formular_abgeschickt) {
  if(
$Formular_Fehler Formular_Check())
  {
    echo 
'<p class="Meldung" id="Fehler">',$Formular_Fehler,'</p>';
  
// elseif(@mail(MAILTO, "Anfrage", print_r($_POST,true), $AddHeader))
  
}
  elseif(@
mail(MAILTO"Anfrage"anfragetext($_POST,true), $AddHeader))
  {
    echo 
'<p class="Meldung" id="OK">Ihre Nachricht wurde erfolgreich verschickt, Danke!</p>
    <p>Sie erhalten umgehend eine Bestätigung.</p>'
;
    
$mailversendet true;
  }
  else echo 
'<p class="Meldung" id="Fehler">Server-Fehler !</p>';
}

if ( 
$mailversendet <> true)
{

?>


<form action="<?php echo $_SERVER['SCRIPT_NAME']; ?>" method="post" enctype="multipart/form-data" >
<table width="570px" cellspacing="1" cellpadding="2" border="0">
<tbody>

                    <div class="tab_tab">
                    <tr >

                          <td colspan="7" ><span class="tab_h2" >Pers&ouml;nliche Angaben</span></td>
            </tr>
            </div>
<tr><td colspan="7">&nbsp;</td></tr>
              <tr class="tab_text">
                <td>Name*:</td>
                <td>&nbsp;</td>
                <td><input name="name" size="18" type="text"></td>
                <td>&nbsp;</td>
                <td>Vorname*:</td>
                <td>&nbsp;</td>
                <td><input name="vorname" size="18" type="text"></td>
              </tr>
              <tr>
                <td>Telefonnummer*:</td>
                <td>&nbsp;</td>
                <td><input name="telefon" size="18" type="text"></td>
                <td>&nbsp;</td>

                <td>Mobil*</span>:</td>
                <td>&nbsp;</td>
                <td><input name="mobil" size="18" type="text"></td>
              </tr>
               <tr>
                <td>Firma*:</td>
                <td>&nbsp;</td>
                <td><input name="firma" size="18" type="text"></td>
                <td>&nbsp;</td>

                <td>E-Mail*</span>:</td>
                <td>&nbsp;</td>
                <td><input name="eMail" size="18" type="text"></td>
              </tr>
              <tr><td colspan="7"><hr>&nbsp;</td>
             </tr>
<table width="570px" cellspacing="1" cellpadding="2" border="0">
<tbody>
<tr><td colspan="15" align="center"><span class="tab_h2">Umzugsgutliste</span></td></tr>

                <td colspan="15" align="center"><span class="tab_h3">Wohnzimmer/Esszimmer</span></td>
              </tr>
<tr class="fontweightbold">
                <td>St&uuml;ck</td>
                <td>&nbsp;</td>
                <td>Gegenstand</td>
                <td>&nbsp;</td>
                <td>RE</td>
                <td>&nbsp;</td>
                <td nowrap="nowrap">Ges. RE</td>
                <td>&nbsp;</td>
                <td>St&uuml;ck</td>
                <td>&nbsp;</td>
                <td>Gegenstand</td>
                <td>&nbsp;</td>
                <td>RE</td>
                <td>&nbsp;</td>
                <td  nowrap="nowrap">Ges. RE</td>
              </tr>
                           <tr>
                <td><input name="[]wo_1" size="2" class="eingabe" type="text"></td>
                <td>&nbsp;</td>
                <td>Sofa/Sitz/Liege</td>
                <td>&nbsp;</td>
                <td>1</td>
                <td>&nbsp;</td>
                <td><input name="[]wo_1_ges" size="4" class="ausgabe" type="text" readonly></td>
                <td>&nbsp;</td>
                 <td><input name="[]wo_21" size="2" class="eingabe" type="text"></td>
                <td>&nbsp;</td>
                <td>Sessel mit Armlehnen</td>
                <td>&nbsp;</td>
                <td>8</td>
                <td>&nbsp;</td>
                <td><input name="[]wo_21_ges" size="4" class="ausgabe" type="text" readonly></td>
              </tr>
                           <tr>
                <td><input name="[]wo_2" size="2" class="eingabe" type="text"></td>
                <td>&nbsp;</td>
                <td>Schaukelstuhl</td>
                <td>&nbsp;</td>
                <td>8</td>
                <td>&nbsp;</td>
                <td><input name="[]wo_2_ges" size="4" class="ausgabe" type="text" readonly></td>
                <td>&nbsp;</td>
                <td><input name="[]wo_22" size="2" class="eingabe" type="text"></td>
                <td>&nbsp;</td>
                <td>Stuhl</td>
                <td>&nbsp;</td>
                <td>2</td>
                <td>&nbsp;</td>
                <td><input name="[]wo_22_ges" size="4" class="ausgabe" type="text" readonly></td>
              </tr>
                           <tr>
                <td><input name="[]wo_3" size="2" class="eingabe" type="text"></td>
                <td>&nbsp;</td>
                <td>Beistelltisch</td>
                <td>&nbsp;</td>
                <td>2</td>
                <td>&nbsp;</td>
                <td><input name="[]wo_3_ges" size="4" class="ausgabe" type="text" readonly></td>
                <td>&nbsp;</td>
                <td><input name="[]wo_23" size="2" class="eingabe" type="text"></td>
                <td>&nbsp;</td>
                <td>Tisch klein</td>
                <td>&nbsp;</td>
                <td>4</td>
                <td>&nbsp;</td>
                <td><input name="[]wo_23_ges" size="4" class="ausgabe" type="text" readonly></td>
              </tr>

              <tr>
                <td colspan="7"><input value="Summe" onclick="wohnzimmer_rech()" name="button_[]wo_sum" type="button">
                                        <input value="l&ouml;schen" onclick="wohnzimmer_clear()" name="button_[]wo_clear" type="button"></td>
                <td>&nbsp;</td>
                <td>&nbsp;</td>
                <td>&nbsp;</td>
                <td colspan="4">gesamt :  </td>








                 <td><input name="[]wo_ges" size="4" class="ausgabe" type="text" readonly></td>
              </tr>
                          <tr><td colspan="15"><hr></td></tr>
</tbody>
<table style="margin: 0 0 0 450px;">
<tbody>
<tr>

                      <td colspan="3"><label >Gesamtsumme:</label><textarea name="ergebnis"  readonly="readonly" style="margin: 0 0 -10px 0;width: 100px; height: 10px;"></textarea></td>

                      <td colspan="2" width="20%">
                        <input name="summe" value="summe" readonly="readonly" type="hidden">
                      </td>
                    </tr>

                    <tr>
                      <td width="25%">&nbsp;</td>
                      <td width="3%">&nbsp;</td>
                      <td width="52%">&nbsp;</td>
                      <td colspan="2" width="20%">&nbsp;</td>
                    </tr>
                    <td width="25%">
                        <input value="Gesamtrechnung" onclick="gesamtrechnung();" name="abschliessen" type="button">
                      </td>
</tbody>
</table>
<table width="570px" cellspacing="1" cellpadding="2" border="0">
<tbody>
<tr>
                <td colspan="3">
                  <p>
                    <input name="adresse_alt" readonly="readonly" type="hidden">
                    <input name="adresse_neu" readonly="readonly" type="hidden">
                    <input name="verpackung" readonly="readonly" type="hidden">
                    <br>
                    <span class="text">Hier können Sie alles abschicken.
                    Klicken Sie bitte zun&auml;chst auf "Gesamtrechnung".
                    Alle Daten werden zusammengefasst und übernommen. Standardm&auml;ßig
                    werden Name und Vorname als "Betreff“ eingesetzt.
                    Das erleichtert es uns, die Daten zuzuordnen. Dann auf "Abschicken" klicken.
                    Die Daten werden versendet.<br>
                  </span></p>
                </td>
              </tr>
              <tr>
                <td colspan="3">
                    <tr>
                      <td width="25%"></td>
                      <td width="3%">&nbsp;</td>
                      <td width="52%">&nbsp;</td>
                      <td colspan="2" width="20%">&nbsp;</td>
                    </tr>
                    <tr>
                      <td colspan="5" height="27">Betreff*:
                          <input name="subject" size="33" maxlength="100" type="text">
                      </td>
                    </tr>
                    <tr>
                      <td width="25%">&nbsp; </td>
                      <td width="3%">&nbsp;</td>
                      <td width="52%">&nbsp; </td>
                      <td colspan="2" width="20%">&nbsp;</td>
                    </tr>
                    <tr>
                      <td colspan="5">&nbsp; </td>
                    </tr>
                    <tr>
                      <td width="25%">&nbsp;</td>
                      <td width="3%">&nbsp;</td>
                      <td width="52%">&nbsp;</td>
                      <td colspan="2" width="20%">&nbsp;</td>
                    </tr>



                    <tr>

                      <label>Ihre Nachricht:</label>
                          <fieldset id="Nachricht" style="border: none;">

                                         <textarea name="Nachricht" id="Nachricht"  ><?php
                                         Formular_Eingabe
('Nachricht'); ?></textarea>
                                         </fieldset>

                      <td width="3%">&nbsp;</td>
                      <td width="52%">
                        <input name="abschicken" value="abschicken" class="eingabe" type="submit">
&nbsp;
                    <input name="reset" value="Angaben l&ouml;schen" class="eingabe" type="reset">
                      </td>
                      <td colspan="2" width="20%">&nbsp;</td>
                    </tr>
                    <tr>
                      <td width="25%">&nbsp;</td>
                      <td width="3%">&nbsp;</td>
                      <td width="52%">&nbsp;</td>
                      <td colspan="2" width="20%">&nbsp;</td>
                    </tr>
                    <tr>
                      <td width="25%">&nbsp;</td>
                      <td width="3%">&nbsp;</td>
                      <td width="52%">&nbsp; </td>
                      <td colspan="2" width="20%">&nbsp;</td>
                    </tr>
</tbody>
                </table>
</form><div id="more">
<?php
}
?>
I appreciate many of the answers, thank you.