What are the implications of using external libraries in PHP, and how can developers mitigate potential issues?

When using external libraries in PHP, developers need to be cautious of potential security vulnerabilities and compatibility issues. To mitigate these risks, developers should regularly update the libraries they use to the latest versions, verify the source of the library to ensure it is reputable, and sanitize input data to prevent injection attacks.

// Example of updating a library using Composer
composer update