What are the potential pitfalls of updating PHP manually in a local network setup?

Potential pitfalls of updating PHP manually in a local network setup include compatibility issues with existing code, breaking functionality of applications, and security vulnerabilities if not updated properly. To avoid these pitfalls, it is recommended to thoroughly test the updated PHP version with all existing applications, backup data before updating, and follow best practices for secure PHP configuration.

// Sample PHP code snippet for updating PHP version in a local network setup

// Ensure to backup all data before updating PHP
// Test the updated PHP version with all existing applications
// Follow best practices for secure PHP configuration