What are some potential pitfalls of using eval in PHP code?

Using eval in PHP code can introduce security vulnerabilities as it allows for the execution of arbitrary code. This can lead to code injection attacks if user input is not properly sanitized. To avoid this, it is recommended to find alternative solutions to dynamic code execution.

// Avoid using eval in PHP code
$unsafeCode = $_POST['user_input'];
eval($unsafeCode); // This is unsafe and can lead to code injection

// Instead, consider using other methods such as switch statements or functions