<?PHP
    $host="localhost:D:\rent2.fdb";
    $username="SYSDBA";
    $password="masterkey";
    $dbh = ibase_connect($host, $username, $password)
         or die("failed to connect ". ibase_errcode());
    $stmt="SELECT NUMBERID FROM CUSTOMERS";
    $result= ibase_query($dbh, $stmt);
       
        if ($result==0)
           echo("<B>Error!</B>");
    ?>

$host="localhost:D:\XAMPP\htdocs\bal-vod\rent.fdb";

 <?PHP
$host="localhost:D:\XAMPP\htdocs\bal-vod\rent.fdb";
$username="SYSDBA";
$password="masterkey";
$dbh = ibase_connect($host, $username, $password) or die("failed to connect ". ibase_errmsg());
$stmt="SELECT NUMBERID FROM CUSTOMERS";
$result= ibase_query($dbh, $stmt);      
if ($result==0)
echo("<B>Error!</B>");
?>

 <?PHP
$host='localhost:D:/XAMPP/htdocs/bal-vod/rent.fdb';
$username="SYSDBA";
$password="masterkey";
$dbh = ibase_connect($host, $username, $password) or die("failed to connect ". ibase_errmsg());
$sel1="SELECT NUMBERID FROM CUSTOMER WHERE NUMBERID = " . $_GET["nid"];
$result= ibase_query($dbh, $sel1);
if ($result==0)
	{
        echo("Error!");
	{
else ($result==1)
	{
	// выбираем ID,LODGINSID из бд который находится в одной строке с тем, что ввел пользователь.
	$sel2="SELECT ID,LODGINSID FROM CUSTOMER WHERE NUMBERID = '$sel1'";
	}
?> 

$sel2="SELECT ID,LODGINSID FROM CUSTOMER WHERE NUMBERID = '$sel1'"; 

 <?PHP
    $host='localhost:D:/XAMPP/htdocs/bal-vod/rent.fdb';
    $username="SYSDBA";
    $password="masterkey";
    $dbh = ibase_connect($host, $username, $password) or die("failed to connect ". ibase_errmsg());
    $sel1="SELECT NUMBERID FROM CUSTOMER WHERE NUMBERID = '" . $_GET["nid"] . "'" ;
    $result = ibase_query($dbh, $sel1);
    if ($result==0)
	{
        echo("Error!");
	}
	else
	{
	echo("working");
	}
?> 

 <?PHP
    $host='localhost:D:/XAMPP/htdocs/bal-vod/rent.fdb';
    $username="SYSDBA";
    $password="masterkey";
    $dbh = ibase_connect($host, $username, $password) or die("failed to connect ". ibase_errmsg());
    $sel1="SELECT NUMBERID FROM CUSTOMER WHERE NUMBERID = '" . $_GET["nid"] . "'" ;
    $result = ibase_query($dbh, $sel1);
	$row1 = ibase_fetch_row ($result);
	print_r ($row1);
?>

<?PHP
    $host='localhost:D:/XAMPP/htdocs/bal-vod/rent.fdb';
    $username="SYSDBA";
    $password="masterkey";
    $dbh = ibase_connect($host, $username, $password) or die("failed to connect ". ibase_errmsg());
    $sel1="SELECT NUMBERID FROM CUSTOMER WHERE NUMBERID = '" . $_GET["nid"] . "'" ;
    $result = ibase_query($dbh, $sel1);
	while ($row1 = ibase_fetch_object($result)) 
  {
    if ($row1->NUMBERID == $cct) $pagetitle .= " :: ".mb_strtolower($row1->NUMBERID);
  }
?>

while ($row1 = ibase_fetch_object($result)) 
  {
	if ($row1->NUMBERID)
	{
	echo "working";
	}
	else
	{
	echo "shit";
	}
}

<?PHP
$host="localhost:D:\rent2.fdb";
$username="SYSDBA";
$password="masterkey";
$dbh = ibase_connect($host, $username, $password)
     or die("failed to connect ". ibase_errcode());
$stmt="SELECT NUMBERID FROM CUSTOMERS";
$result= ibase_query($dbh, $stmt);
   
while($row1 = mysql_fetch_assoc($result)){  //Получение данных о пользователе
 
        $table['NUMBERID'] = $row1['NUMBERID'];       // ID Пользователя
}
 
//Проверка
 
if ($_GET['nid'] == $table['NUMBERID']){ //проверка на совпадение
 
                //id true
                // tut poka pusto
 
        }else{  
                //id false
                // tut poka pusto
 
        }

?>

while($row1 = ibase_fetch_assoc($result)){  //Получение данных о пользователе
 
        $table['NUMBERID'] = $row1['NUMBERID'];       // ID Пользователя
}

 <?PHP
$host='localhost:D:\XAMPP\htdocs\bal-vod\rent.fdb';
$username="SYSDBA";
$password="masterkey";
$dbh = ibase_connect($host, $username, $password) or die("failed to connect ". ibase_errmsg());
$sel1="SELECT NUMBERID,LODGINGSID FROM CUSTOMER WHERE NUMBERID = '" . $_GET["nid"] . "'" ;
$result1 = ibase_query($dbh, $sel1);

while($row1 = ibase_fetch_assoc($result1)){  //Получение данных о пользователе
 
	$table1['NUMBERID'] = $row1['NUMBERID'];       // ID Пользователя
	$table1['LODGINGSID'] = $row1['LODGINGSID'];
}
 
//Проверка
 
if ($_GET['nid'] == $table1['NUMBERID']) // равно ли get_nid = numberid ?
	{ 
		$sel2="SELECT BUILDINGID,NUMBER FROM LODGINGS WHERE ID = '" . $table1["LODGINGSID"] . "'" ; // ищем здание!
		$result2 = ibase_query($dbh, $sel2);
			while($row2 = ibase_fetch_assoc($result2))
			{
			$table2['BUILDINGID'] = $row2['BUILDINGID'];       // здание пользователя
			$table2['NUMBER'] = $row2['NUMBER']; // номер квартиры
			}
		$sel3="SELECT LOCALITYID,STREETID,NUMBER FROM BUILDING WHERE ID = '" . $table2['BUILDINGID'] . "'" ; // Получаем город, улицу, номер здания!
		$result3 = ibase_query($dbh, $sel3);
			while($row3 = ibase_fetch_assoc($result3))
			{
			$table3['LOCALITYID'] = $row3['LOCALITYID']; // город
			$table3['STREETID'] = $row3['STREETID']; // улица
			$table3['NUMBER'] = $row3['NUMBER']; // номер дома
			}
		echo "wow";
	}
	else
	{  
	echo "nope";
	}
?>