How to use $_SERVER['PHP_SELF'] to save record and print simultaneouly

[User 13659767]

How to use a php $_SERVER['PHP_SELF'] to insert form data into Mysql database and print
same form data automatically

// check which button was clicked
// perform calculation
$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
$editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "form1")) {
$insertSQL = sprintf("INSERT INTO reservation (`Class of Room`, `Room Number`, `Customer Name`, `Customer Address`, `Phone number`, Occupation, Amount, `Check in Time`, `Date`, Duration, `Name of Receptionist`) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)",
GetSQLValueString($_POST['Class_of_Room'], "text"),
GetSQLValueString($_POST['Room_Number'], "text"),
GetSQLValueString($_POST['Customer_Name'], "text"),
GetSQLValueString($_POST['Customer_Address'], "text"),
GetSQLValueString($_POST['Phone_number'], "text"),
GetSQLValueString($_POST['Occupation'], "text"),
GetSQLValueString($_POST['Amount'], "text"),
GetSQLValueString($_POST['Check_in_Time'], "text"),
GetSQLValueString($_POST['Date'], "date"),
GetSQLValueString($_POST['Duration'], "text"),
GetSQLValueString($_POST['Name_of_Receptionist'], "text"));

mysql_select_db($database_Morrendb, $Morrendb);
$Result1 = mysql_query($insertSQL, $Morrendb) or die(mysql_error());

$insertGoTo = "reservation.php";
if (isset($_SERVER['QUERY_STRING'])) {
$insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
$insertGoTo .= $_SERVER['QUERY_STRING'];
}
header(sprintf("Location: %s", $insertGoTo));
}
?>

[Lost User]

See How can I access data on a textbox using $_SERVER['PHP_SELF'] from another page[^]