In previous post we design the login form, so finally  implement PHP code

// LOG USER IN
	if (isset($_POST['login_btn'])) {
	$email = esc($_POST['email']);
	$password = esc($_POST['password']); 									 				
	$time=time()-60;
	$ip_address=getIpAddr();
	$check_login_result= "SELECT count(*) as total_count from login_log WHERE try_time>$time and email='$email'";
	$check_result = mysqli_query($conn, $check_login_result);
	$check_login_row = mysqli_fetch_assoc($check_result);
	$total_count=$check_login_row['total_count'];
	if($total_count==6){
	array_push($errors, 'You have too many login attempts failed.');
	 $deactivate_account=  "UPDATE users SET  status = 0 WHERE email='$email'";
        $result = mysqli_query($conn, $deactivate_account);
        array_push($errors, 'For a security reason your account was deactivated. Contact the account Administrator at info@g3techdesign.com');
	}else{	    		
	       if (empty($email)) {array_push($errors, "Username required"); }
		if (empty($password)) {array_push($errors, "Password required"); }
		// attempt login if no errors on form
		if (count($errors) == 0) {
			$password = md5($password); // encrypt password
			$sql = "SELECT * FROM users WHERE (email='$email' OR username='$email') AND password='$password' LIMIT 1";
            $result = mysqli_query($conn, $sql);
			if (mysqli_num_rows($result) > 0) {
				$row = mysqli_fetch_assoc($result);
				$verified = $row['verified'];
				$status = $row['status'];
				$email = $row['email'];
				$created_at = $row['created_at'];
				$verification_at = date("F j, Y ", strtotime($created_at));
				$created_at = strtotime($created_at);
				$created_at = date('M d Y',$created_at);
				if($status == 1){
				if($verified == 1){
				// get id of created user
				$reg_user_id = $row['id']; 
                // put logged in user into session array
				$_SESSION['user'] = getUserById($reg_user_id); 
                  if($reg_user_id)
                  {
                  if(!empty($_POST["remember"]))
                  {
                  setcookie ("emaillogin", $_POST["email"], time() + (1*2629440));/*10 * 365 * 24 * 60 * 60*/
                  setcookie ("password", $_POST["password"], time() + (1*2629440));/*10 * 365 * 24 * 60 * 60*/
                  setcookie ("remember", $_POST["remember"], time() + (1*2629440));/*10 * 365 * 24 * 60 * 60*/
                  }
                  else
                  {
                  if(isset($_COOKIE["emaillogin"]))
                  {
                  setcookie ("emaillogin", "");
                  }
                  if(isset($_COOKIE["password"]))
                  {
                  setcookie ("password", "");
                  }
                  if(isset($_COOKIE["remember"]))
                  {
                  setcookie ("remember", "");
                  }
		 }
	  }
     // Gets data from URL parameters.
                    if(isset($_GET['add_location'])) {
                        add_location();
                    }
                    function add_location(){
                        $lat = $_GET['lat'];
                        $lng = $_GET['lng'];
                        $description =$_GET['description'];
                        // Inserts new row with place data.
                        $query = sprintf("INSERT INTO users "
                            . " (latitude, longitude, description) "
                            . " VALUES ('%s', '%s', '%s');",
                            mysqli_real_escape_string($con,$lat),
                            mysqli_real_escape_string($con,$lng),
                            mysqli_real_escape_string($con,$description));
                        $result = mysqli_query($con,$query);
                    }
		          $update=  "UPDATE users SET lastloginprevious=lastlogin, lastlogin = now(), latitude = 45.7811111, longitude =45.7811111  WHERE email='$email'";
		          //".$_POST['lat']." ".$_POST['lng']." 
                  $result = mysqli_query($conn, $update);
                  $email_post = esc($_POST['email']);
                  $delete=  "DELETE FROM login_log WHERE email='$email_post'";
                  $result = mysqli_query($conn, $delete);
				// if user is admin, redirect to admin area
				if ( in_array($_SESSION['user']['role'], ["Admin", "Author"])) {
					$_SESSION['message'] = "<i class='fas fa-check-circle fa-2x'></i> Welcome " .$_SESSION['user']['firstname']. " ".$_SESSION['user']['lastname']. ", you are now logged in as Admin/Author";
					// redirect to admin area
					header('location: ' . BASE_URL . 'admin/dashboard.php');
					exit(0);
				} else {
                    	$_SESSION['message'] ="<div class='input-container'>
                       <i class='fas fa-check-circle fa-2x'></i> Welcome " .$_SESSION['user']['firstname']. " ".$_SESSION['user']['lastname']. ", you are now logged in as USER. You can explore member contents. </div>";
					// redirect to public area
					header('location: '. BASE_URL . 'channel.php');				
					exit(0);
				}	
				}else{
					array_push($errors, '<i class="fas fa-times-circle fa-2x"></i> We are sorry for the inconvenience. This account has not been verified yet. A verification link was sent to ' .$email. ' on ' .$verification_at );
				}
				}else{
				array_push($errors, '<i class="fas fa-times-circle fa-2x"></i> We are sorry for the inconvenience. This account was deactivated. Contact the account Administrator at info@g3techdesign.com to solve a problem' );
	                      }							
								
			}else {					
			$total_count++;
			$rem_attm=6-$total_count;
			if($rem_attm==0){
				array_push($errors,'<i class="fas fa-times-circle fa-2x"></i> Too many login attempts failed . Please try to login after 60 seconds. Do not attempt to login before a time window. Your account will be deactivated. OR <a href=\password-recovery/enter_email><font color="blue">Reset Your Password</font></a>');
				array_push($errors,"<div id='status' class='message' style='background-color:transparent;border:0px solid transparent;'></div>");
			}else{
				array_push($errors, '<i class="fas fa-times-circle fa-2x"></i> Your Email or Password does not matched. You submitted wrong credentials. Try Again or <a href=\password-recovery/enter_email><font color="blue">Reset Your Password</font></a><br/><center><i style=color:red><sup>*</sup>'.$rem_attm.' attempts remaining.</i></center>');
			}
			$try_time=time();
			$insert ="INSERT INTO login_log(email,ip_address,try_time) values('$email','$ip_address','$try_time')";
			mysqli_query($conn, $insert);
				
			}
        }
       }
}

if you wandering what is the getIpAddress() function is identify a user based on the Ip address of the device connected to count the post view(check out count the visitor when the visit the post )

 function getIpAddr(){
    if (!empty($_SERVER['HTTP_CLIENT_IP'])){
       $ipAddr=$_SERVER['HTTP_CLIENT_IP'];
    }elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
       $ipAddr=$_SERVER['HTTP_X_FORWARDED_FOR'];
    }else{
       $ipAddr=$_SERVER['REMOTE_ADDR'];
    }
   return $ipAddr;
}
	// escape value from form
	function esc(String $value)
	{	
		// bring the global db connect object into function
		global $conn;

		$val = trim($value); // remove empty space sorrounding string
		$val = mysqli_real_escape_string($conn, $value);

		return $val;
	}