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if (isset ($_POST['submit'])) {
  
  if ($_POST['eingabe'] != "") {
    echo $_POST['eingabe'];
  }

}
else {
?>
<form action="<=$_SERVER['PHP_SELF']?>" method="post">

<div>
  <input type="text" name="eingabe" /><br />
  <input type="submit" name="submit" />
</div>

</form>
<?
}
?>

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function array_stripslashes() {
   code...
}

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INSERT INTO tabelle(spalten) VALUES(werte);

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INSERT INTO User
    (Name,Pass,id,Email)
VALUES
    (werte);