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.....
if(mysql_num_rows($result_liste_erst) > 0){
         while($row = mysql_fetch_assoc($result_liste_erst)){
          $result1 = array(); 
          $result1['ID'] = $row['ord_id']; 
          $result1['ANREDE'] = $row['ord_anrede']; 
          $result1['VORNAME'] = $row['ord_vorname']; 
          $result1['NACHNAME'] = $row['ord_nachname']; 
          ...

          $_SESSION['liste'][] = $result1;
         }
}

echo $_SESSION['liste'];                    

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IdHTTP1.get('http://www.xxxxx.de/aus_delphi.php');                    

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...
echo json_encode($_SESSION['liste']);
?>                    

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procedure TForm1.Button2Click(Sender: TObject);
var
  OB: ISuperObject;
  i:integer;
begin
  OB:=SO(IdHTTP1.get('http://adresse.entfernt/aus_delphi.php'));
  for i := 0 to OB.AsArray.Length - 1 do
    memo1.Lines.Add(ob.AsArray[i].S['VORNAME']);
end;