How can debugging techniques be applied to troubleshoot PHP code that is not writing form data to a database?

Issue: To troubleshoot PHP code that is not writing form data to a database, you can start by checking the database connection, ensuring that the form data is being properly sanitized and validated, and verifying that the SQL query to insert the data is correct. 

// Check the database connection
$connection = mysqli_connect("localhost", "username", "password", "database_name");
if (!$connection) {
    die("Connection failed: " . mysqli_connect_error());
}

// Sanitize and validate form data
$name = mysqli_real_escape_string($connection, $_POST['name']);
$email = mysqli_real_escape_string($connection, $_POST['email']);

// Insert data into the database
$sql = "INSERT INTO users (name, email) VALUES ('$name', '$email')";
if (mysqli_query($connection, $sql)) {
    echo "Data inserted successfully";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($connection);
}

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

Keywords

PHP debugging techniques form data database troubleshooting

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