What are some common mistakes beginners make when trying to read and manipulate database data in PHP?

One common mistake beginners make when trying to read and manipulate database data in PHP is not properly sanitizing user input, which can lead to SQL injection attacks. To prevent this, always use prepared statements and parameterized queries when interacting with the database. 

// Connect to the database
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a statement with a parameterized query
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind the parameter
$stmt->bindParam(':username', $_POST['username']);

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

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

// Loop through the results
foreach ($results as $row) {
    // Manipulate data here
}

Keywords

SQL injection PDO prepared statements mysqli error handling

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