having problems with removing sha1 encryption from my code - php

Question

ill like to remove the sha1 encryption on this code so i can store my password as typed in the database instead of the encrypted code. Am new to coding so I need help
The code (settings_model.php)
<?php
$settings = new Datasettings();
if(isset($_GET['q'])){
$settings->$_GET['q']();
}
class Datasettings {
function __construct(){
if(!isset($_SESSION['id'])){
header('location:../../');
}
}
function changepassword(){
include('../../config.php');
$username = $_GET['username'];
$password = $_GET['password'];
$current = sha1($_POST['current']);
$new = sha1($_POST['new']);
$confirm = sha1($_POST['confirm']);
$q = "select * from userdata where username='$username' and password='$current'";
$r = mysqli_query($db,$q);
if(mysqli_num_rows($r) > 0){
if($new == $confirm){
$r2 = mysqli_query($db,"update userdata set password='$new' where username='$username' and password='$current'");
header('location:../settings.php?msg=success&username='.$username.'');
}else{
header('location:../settings.php?msg=error&username='.$username.'');
}
}else{
header('location:../settings.php?msg=error&username='.$username.'');
}
}
function addaccount(){
include('../../config.php');
$level = $_GET['level'];
$id = $_GET['id'];
$q = "select * from $level where id=$id";
$r = mysqli_query($db,$q);
$row = mysqli_fetch_array($r);
if($level == 'student'){
$username = $row['studid'];
$fname = $row['fname'];
$lname = $row['lname'];
$password = sha1($username.'-'.$fname);
}else{
$username = $row['teachid'];
$fname = $row['fname'];
$lname = $row['lname'];
$password = sha1($username.'-'.$fname);
}
$verify = $this->verifyusername($username);
if($verify){
$q2 = "insert into userdata values(null,'$username','$password','$fname','$lname','$level')";
mysqli_query($db,$q2);
header('location:../'.$level.'list.php?r=added an account');
}else{
header('location:../'.$level.'list.php?r=updated');
}
}
function verifyusername($user){
$q = "select * from userdata where username='$user'";
$r = mysql_query($q);
if(mysql_num_rows($r) < 1){
return true;
}else{
return false;
}
}
function getuser($search){
include('../config1.php');
$user = $_SESSION['id'];
$q = "select * from userdata where username !='$user' and username like '%$search%' order by lname asc";
$r = mysqli_query($db, $q);
return $r;
}
function addaccounts(){
include('../../config1.php');
extract($_POST);
$q = "select * from $level where id=$id";
$r = mysqli_query($db,$q);
$row = mysqli_fetch_array($r);
if($level == 'student'){
$username = $row['studid'];
$fname = $row['fname'];
$lname = $row['lname'];
$password = sha1($username.'-'.$fname);
}else{
$username = $row['teachid'];
$fname = $row['fname'];
$lname = $row['lname'];
$password = sha1($username.'-'.$fname);
}
$verify = $this->verifyusername($username);
if($verify){
$q2 = "insert into userdata values(null,'$username','$password','$fname','$lname','$level')";
mysqli_query($db,$q2);
header('location:../'.$level.'list.php?r=added an account');
}else{
header('location:../'.$level.'list.php?r=updated');
}
}
}
?>
please help need an answer soon. thanks.

Answer 1

just change this line
$confirm = sha1($_POST['confirm']);
to this
$confirm = $_POST['confirm'];