What could be causing the data not to be written to the database in the provided PHP code?

The issue could be caused by not establishing a database connection before attempting to write data to the database. To solve this issue, make sure to establish a connection to the database using mysqli_connect() before executing any queries. 

// Establish a connection to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

$conn = mysqli_connect($servername, $username, $password, $dbname);

// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

// Insert data into the database
$sql = "INSERT INTO table_name (column1, column2, column3) VALUES ('value1', 'value2', 'value3')";

if (mysqli_query($conn, $sql)) {
    echo "Data written to the database successfully";
} else {
    echo "Error writing data: " . mysqli_error($conn);
}

// Close the database connection
mysqli_close($conn);

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