Are there any potential security risks or vulnerabilities to consider when migrating a PHP website with a database online?

One potential security risk to consider when migrating a PHP website with a database online is SQL injection attacks. To prevent this, you should use prepared statements with parameterized queries to sanitize user input and prevent malicious SQL queries from being executed. 

// Connect to the database
$mysqli = new mysqli("localhost", "username", "password", "database");

// Check connection
if ($mysqli->connect_error) {
    die("Connection failed: " . $mysqli->connect_error);
}

// Prepare a SQL query using a parameterized statement
$stmt = $mysqli->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);

// Set the parameter values and execute the query
$username = $_POST['username'];
$stmt->execute();

// Process the results
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // Do something with the data
}

// Close the statement and connection
$stmt->close();
$mysqli->close();

Keywords

SQL injection cross-site scripting data leakage server misconfiguration outdated software

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