What are the potential pitfalls of using outdated MySQL functions like mysql_query in PHP code?

Using outdated MySQL functions like mysql_query in PHP code can lead to security vulnerabilities such as SQL injection attacks. It is recommended to use modern MySQLi or PDO functions with prepared statements to prevent these vulnerabilities. By updating your code to use these newer functions, you can ensure the security of your application. 

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

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

// Prepare a SQL statement
$stmt = $mysqli->prepare("SELECT * FROM users WHERE username = ?");

// Bind parameters
$stmt->bind_param("s", $username);

// Execute the statement
$stmt->execute();

// Get the result set
$result = $stmt->get_result();

// Fetch data from the result set
while ($row = $result->fetch_assoc()) {
    // Process the data
}

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

Keywords

MySQL functions mysql_query deprecated security vulnerability SQL injection

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