What are the common pitfalls in PHP code that can lead to data not being inserted into a database?

One common pitfall in PHP code that can lead to data not being inserted into a database is not properly sanitizing user input, which can result in SQL injection attacks. To prevent this, always use prepared statements with parameterized queries when interacting with a database. Additionally, make sure to handle errors properly to catch any issues that may arise during the database insertion process. 

// Example of using prepared statements to insert data into a database

// Establish a database connection
$pdo = new PDO('mysql:host=localhost;dbname=my_database', 'username', 'password');

// Prepare the SQL statement with placeholders
$stmt = $pdo->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");

// Bind parameters to the placeholders
$stmt->bindParam(':username', $username);
$stmt->bindParam(':email', $email);

// Set the values of the parameters
$username = 'john_doe';
$email = 'john.doe@example.com';

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

Keywords

SQL injection PDO prepared statements data validation error handling

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