Why Isn't My MySQLi INSERT Statement Updating the Database?

Inserting Data using MySQLi

When attempting to insert data using MySQLi, you may encounter a scenario where the code does not update the database despite the absence of errors during debugging. In this question, a user encountered this issue with the following code:

$stmt2 = $conn->prepare("INSERT INTO UserData (username, password) VALUES (?, ?)");
$username = /* $_POST["username"] */ "hi";
$password = /* $_POST["password"] */ "hey";
$stmt2->bind_param('s', $username);
$stmt2->bind_param('s', $password);
$stmt2->execute();

The issue stemmed from the incorrect use of bind_param(). Instead of binding each variable individually, it should be done all at once using the correct syntax. The corrected code is:

$stmt2 = $conn->prepare("INSERT INTO UserData (username, password) VALUES (?, ?)");
$username = /* $_POST["username"] */ "hi";
$password = /* $_POST["password"] */ "hey";
$stmt2->bind_param('ss', $username, $password);
$stmt2->execute();

Additionally, using PHP 5.6 or later, the spread operator (...) can simplify the syntax even further:

$data = ['user' => 'someUser', 'password' => 'secret'];
$stmt2->bind_param('ss', ...$data);

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