What are common pitfalls when retrieving and displaying data from a database in a PHP form?

One common pitfall when retrieving and displaying data from a database in a PHP form is not properly sanitizing the data before displaying it, which can lead to SQL injection attacks. To solve this issue, always use prepared statements or parameterized queries to prevent SQL injection vulnerabilities. 

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

// Retrieve data from the database using a prepared statement
$stmt = $pdo->prepare("SELECT * FROM mytable WHERE id = :id");
$stmt->bindParam(':id', $_GET['id']);
$stmt->execute();
$result = $stmt->fetch();

// Display the retrieved data
echo htmlspecialchars($result['column_name']);

Keywords

SQL injection PDO prepared statements data validation error handling

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