What are common pitfalls to avoid when working with MySQL queries in PHP scripts?

One common pitfall to avoid when working with MySQL queries in PHP scripts is not properly sanitizing user input, which can leave your application vulnerable to SQL injection attacks. To prevent this, always use prepared statements with parameterized queries to securely interact with your database. 

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

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

// Set the parameter and execute the query
$username = "example_user";
$stmt->execute();

// Bind the results to variables
$stmt->bind_result($id, $username, $email);

// Fetch the results
while ($stmt->fetch()) {
    echo "ID: $id, Username: $username, Email: $email <br>";
}

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

Keywords

MySQL PHP scripts SQL injection prepared statements error handling

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