Form data into database using PHP - php

Question

I've created a HTML form that inserts user data into a database using MySQL and PHP.
HTML form:
<form action="index.php" method="POST" >
<div class="container">
<label for="username"><b>Username</b></label>
<input type="text" placeholder="Enter Username" id="username" name="username" required>
<label for="psw"><b>Password</b></label>
<input type="password" placeholder="Enter Password" id="psw" name="psw" required>
<label for="email"><b>Email address</b></label>
<input type="text" placeholder="Email address" id="email" name="email" required>
<input type="submit" value="Submit" name="Submit">
</div>
</form>
index.php:
// Create connection
$dbc = #mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME)
OR die('Could not connect to MySQL: ' .mysqli_connect_error());
if(isset($_POST['Submit'])) {
$USER = (isset($_POST['username']) ? $_POST['username'] : null);
$PASSWORD = (isset($_POST['psw']) ? $_POST['psw'] : null);
$EMAIL = (isset($_POST['email']) ? $_POST['email'] : null);
$stmt = $dbc->prepare("INSERT INTO webapp_db.users (username, password, email) VALUES (?, ?, ?)");
$stmt->bind_param("sss", $USER, $PASSWORD, $EMAIL);
$stmt->execute();
echo "New records created successfully";
} else{
die('Error: '.mysqli_error($dbc));
}
$stmt->close();
$dbc->close();
And I don't get any errors. It says: "New records created successfully" but nothing has been created
Any idea where the problem is? Thank you in advance

Answer 1

Try wrapping the checks into isset() statements like so:
// Create connection
$dbc = #mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME) OR die('Could not connect to MySQL: ' .mysqli_connect_error());
if(isset($_POST['Submit'])) {
$USER = (isset($_POST['username']) ? $_POST['username'] : null);
$PASSWORD = (isset($_POST['psw']) ? $_POST['psw'] : null);
$EMAIL = (isset($_POST['email']) ? $_POST['email'] : null);
$stmt = $dbc->prepare("INSERT INTO webapp_db.users (username, password, email) VALUES (?, ?, ?)");
$stmt->bind_param("sss", $USER, $PASSWORD, $EMAIL);
$stmt->execute();
echo "New records created successfully";
} else{
die('Error: '.mysqli_error($dbc));
}
$stmt->close();
$dbc->close();

Answer 2

Ok, remember that execute function returns a boolean. Try to check if the query were executed with success or not:
$executed = $stmt->execute();
if ($executed == true) { // or just "if ($executed) {" if you prefer
echo "New records created successfully";
} else {
echo "Oops! Something went wrong";
}
But if you need something more precise, ... try with errorInfo function, that returns an array.
if ($executed == 1) {
echo "New records created successfully";
} else {
print_r($stmt->errorInfo());
}