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<?php

// Database info
$host = 'localhost';
$user = 'root';
$pass = '';
$database = 'my_talent';

// Connect to database
$connect = mysqli_connect($host, $user, $pass, $database);

// Character set
mysqli_query($connect, "SET NAMES 'utf8'");
mysqli_query($connect, 'SET CHARACTER SET utf8');

?>
<!DOCTYPE>
<html>
<head>
<title>Farris Website</title>
</head>
<body>

<?php

    $username = $_POST['username'];

    $q = mysqli_query($connect, "SELECT * FROM users WHERE username = '{$username}'");

    if(mysqli_num_rows($q) > 0){
        echo 'Ok';
    }else{
        echo 'Not';
    }

?>

<form action="" method="POST">
    <input type="text" name="username" />
    <input type="submit" value="Submit" />
</form>