What best practices should PHP developers follow to prevent special characters from being converted into HTML entities like ö in database entries when using PDO?

To prevent special characters from being converted into HTML entities like ö in database entries when using PDO, PHP developers should set the charset to utf8mb4 in the database connection, use prepared statements with parameter binding, and ensure that data is properly encoded and decoded using htmlspecialchars and htmlspecialchars_decode functions. 

// Set the charset to utf8mb4 in the database connection
$dsn = 'mysql:host=localhost;dbname=mydatabase;charset=utf8mb4';
$username = 'username';
$password = 'password';
$options = array(
    PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8mb4',
);
$pdo = new PDO($dsn, $username, $password, $options);

// Use prepared statements with parameter binding
$stmt = $pdo->prepare('INSERT INTO mytable (column1, column2) VALUES (:value1, :value2)');
$stmt->bindParam(':value1', $value1);
$stmt->bindParam(':value2', $value2);
$stmt->execute();

// Ensure data is properly encoded and decoded
$value = htmlspecialchars($input, ENT_QUOTES, 'UTF-8');
$input = htmlspecialchars_decode($value, ENT_QUOTES);

Keywords

PHP PDO htmlentities special characters database entries

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