How can a beginner in PHP avoid common pitfalls when fetching data from a MySQL database?

One common pitfall when fetching data from a MySQL database in PHP is not properly sanitizing user input, which can lead to SQL injection attacks. To avoid this, always use prepared statements with parameterized queries to securely fetch data from the database. 

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

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

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

// Fetch the results
$result = $stmt->get_result();

// Loop through the results and display them
while ($row = $result->fetch_assoc()) {
    echo $row['username'] . "<br>";
}

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

Keywords

MySQL database fetching data beginner PHP

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