Insert Code
$tid = $_POST['tid'];
$name = $_POST['name'];
$email = $_POST['email'];
$pass = $_POST['pass'];


// please remove last ' , (coma)' from fileds

mysqli_query($conn,"INSERT INTO `titus` ( `tid`,`name`,`email`,`pass`, ) VALUES ('$tid','$name','$email','$pass',)");
Select Single
$getdata = mysqli_query($conn,"SELECT * FROM titus ");
$row = mysqli_fetch_array($getdata);
$tid = $row['tid'];
$name = $row['name'];
$email = $row['email'];
$pass = $row['pass'];
Select While
$getdata = mysqli_query($conn,"SELECT * FROM titus ");
while($row = mysqli_fetch_array($getdata)) {
$tid = $row['tid'];
$name = $row['name'];
$email = $row['email'];
$pass = $row['pass'];
}
Delete Code
$getid = $_GET['id'];
mysqli_query($conn,"DELETE FROM titus WHERE tid ='$id' ");
Update Single Code
$tid = $_POST['tid'];
$name = $_POST['name'];
$email = $_POST['email'];
$pass = $_POST['pass'];

mysqli_query($conn,"UPDATE `titus` SET `tid` = '$tid' WHERE `titus`.`tid` = 1")
mysqli_query($conn,"UPDATE `titus` SET `name` = '$name' WHERE `titus`.`tid` = 1")
mysqli_query($conn,"UPDATE `titus` SET `email` = '$email' WHERE `titus`.`tid` = 1")
mysqli_query($conn,"UPDATE `titus` SET `pass` = '$pass' WHERE `titus`.`tid` = 1")