What are the potential pitfalls of using copied code from various sources to create a PHP script?

Potential pitfalls of using copied code from various sources to create a PHP script include compatibility issues, security vulnerabilities, and licensing conflicts. To mitigate these risks, it is essential to thoroughly review and understand the code before integrating it into your script, ensure it is properly attributed to the original source, and adhere to any licensing requirements.

// Example of properly attributing copied code in a PHP script
// Original source: https://www.example.com/source-code

// Start of copied code
// ...
// End of copied code

// Attribution to the original source
// This code snippet was adapted from https://www.example.com/source-code