Check Login.php

<?php
// checklogin.php
// version 1.0
// Generation Time: 19/3/14
// Server version: 5.6.11 MySQL Community Server (GPL)
// PHP Version: 5.5.3
// Database: `user_logon`
// --------------------------------------------------
// This file allows a user to submit username and password.
// This file also establishes a connection to MySQL,
// checks whether the username/password combination is in the database.
// If exists, will redirect to login_success.php
// --------------------------------------------------

ob_start();
$host="localhost"; // Host name
$username="root"; // Mysql username
$password=""; // Mysql password
$db_name="user_login"; // Database name
$tbl_name="members"; // Table name


// Connect to server and select database.
//conection:
$con = mysqli_connect("$host", "$username")or die("cannot connect");
mysqli_select_db($con, "$db_name")or die("cannot select DB");


 // Define $myusername and $mypassword
$myEmail=$_POST['UsernameInput'];
$mypassword=$_POST['passwordInput'];
$date = (new DateTime())->setTimeZone(new DateTimeZone('Europe/London'))->format('d-m-Y H:i:s');
$browser = $_SERVER ['HTTP_USER_AGENT'];
$IP = $_SERVER ['REMOTE_ADDR'];
$filler = " ";
// Create the SQL query and run the query using mysqli_query()
$sql="SELECT * FROM members WHERE username='$myEmail' and password=SHA1('$mypassword')";
$result=mysqli_query($con, $sql);


// Mysql_num_row is counting table row
$count=mysqli_num_rows($result);

// If result matched $myusername and $mypassword, table row must be 1 row
$counter =0;
$contents = file_get_contents('statistics.txt');
if($count==1){ ($counter++ );
  $total = $counter + $contents;

  header("Location:contentManagement.php");

 $file = fopen("statistics.txt", "w")or die("unable to open file.");
 fwrite($file, "$total");
 fclose($file);



 }
 else {
   echo "Wrong Username or Password";
   $myfile = fopen("ErrorLog.txt", "a") or die("unable to open file!");
			//$txt = "Username$myEmail,$mypassword,$date".PHP_EOL;
			fwrite($myfile, "Username: "."$myEmail".PHP_EOL);
			fwrite($myfile, "Password: "."$mypassword".PHP_EOL);
			fwrite($myfile, "Date & Time: "."$date".PHP_EOL);
			fwrite($myfile, "Browser: "."$browser".PHP_EOL);
			fwrite($myfile, "IP address: "."$IP".PHP_EOL);
			fwrite($myfile, "$filler".PHP_EOL);
			fclose($myfile);
 }

ob_end_flush();




?>