What potential issues or errors might arise when implementing additional selection fields in a PHP template?

One potential issue that might arise when implementing additional selection fields in a PHP template is the need to properly handle user input to prevent security vulnerabilities such as SQL injection attacks. To solve this issue, you can use prepared statements or parameterized queries to safely interact with the database. 

// Example of using prepared statements to handle user input securely
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $username);
$stmt->execute();

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PHP template selection fields errors implementation

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