PHP Php Form problem

<?php
//--------------------------Set these paramaters--------------------------

// Subject of email sent to you.
$subject = 'Results from Contact form'; 

// Your email address. This is where the form information will be sent. 
$emailadd = 'emailaddress.co.uk'; 

// Where to redirect after form is processed. 
$url = 'Enquiry sent.html'; 

// Makes all fields required. If set to '1' no field can not be empty. If set to '0' any or all fields can be empty.
$req = '1'; 

// --------------------------Do not edit below this line--------------------------
$text = "Results from form:\n\n"; 
$space = ' ';
$line = '
';
foreach ($_POST as $key => $value)
{
if ($req == '1')
{
if ($value == '')
{echo "$key is empty";die;}
}
$j = strlen($key);
if ($j >= 20)
{echo "Name of form element $key cannot be longer than 20 characters";die;}
$j = 20 - $j;
for ($i = 1; $i <= $j; $i++)
{$space .= ' ';}
$value = str_replace('\n', "$line", $value);
$conc = "{$key}:$space{$value}$line";
$text .= $conc;
$space = ' ';
}
mail($emailadd, $subject, $text, 'From: '.$emailadd.'');
echo '<META HTTP-EQUIV=Refresh CONTENT="0; URL='.$url.'">';
?>

foreach ($_POST as $key => $value)

foreach ($_POST['feld'] as $key => $value)

foreach ($_POST as $key => $value)

foreach ($_POST['feld'] as $key => $value)

<form action="index.php" method = "POST">
  <input type = "TEXT" name = "name">
  <input type = "TEXT" name = vorname">
  <input type = "SUBMIT" name = "submit" value="Senden">
</form>

$_POST = {
   'feld1' => "abc",
   'feld2' => "def",
   'feld3' => "ghi"
}

foreach($_POST['feld1'] as $key => $value)

$_POST =  array(
   'feld1' => "abc",
   'feld2' => "def",
   'feld3' => "ghi"
);

foreach($_POST as $key => $value) {
   echo "Key: " . $key . " => " . $value . "<br>";
}

Key: feld1 => abc
Key: feld2 => def
Key: feld3 => ghi

<form method="post" action ="b.php">
    <input type="text" name="bla">
    <input type="text" name="bla2">
    <input type="text" name="bla3">
    <input type="submit" value="keine">
</form>
<?php
foreach($_POST as $key => $value ){
    echo "K: ".$key." -> ".$value."<br>";
}
echo "<hr>";
for($i = 0; $i < count($_POST); $i++) {
    echo "Post ".$i." -> ".$_POST[$i]."<br>";
}
?>