user-registration/AddUser.php at master · povstenko/user-registration · GitHub

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<?php
	$message = '';

	if (!empty($_POST)) {
		if (isset($_POST["email"]) && isset($_POST["username"]) && isset($_POST["password"]))
		{
			$fileString=file_get_contents("user.txt");
			$pos=strstr($fileString, $_POST["username"]);
			if ($pos===false) {
				$userdata = $_POST["email"].": ".$_POST["username"].": ".$_POST["password"]."\r\n";
				$file=fopen("user.txt", "a");
				fwrite($file, $userdata);
				fclose($file);
				header("Location: index.php");
			}
			else {
				$message = 'User with that username already exists';
			}
		}
		else {
			$message = 'Please enter data in needed inputs';
		}
	}
 ?>
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Add User</title>
	<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
</head>
<body>
	<div class="container">
	<?= $message ?>
		<div class="row">
			<form action="AddUser.php" method="post">
			  <div class="form-group">
			    <label for="InputEmail">Email address</label>
			    <input type="email" class="form-control" id="InputEmail" aria-describedby="emailHelp" placeholder="Enter email" name="email">
			    <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
			  </div>
			  <div class="form-group">
			  	<label for="Username">Username</label>
			  	<input type="text" class="form-control" id="Username" placeholder="username" name="username">
			  </div>
			  <div class="form-group">
			    <label for="InputPassword">Password</label>
			    <input type="password" class="form-control" id="InputPassword" placeholder="Password" name="password">
			  </div>
			  <button type="submit" class="btn btn-primary" name="done">Submit</button>
			</form>
		</div>
	</div>
	<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>