Are there best practices for optimizing PHP code execution to avoid unexpected outcomes?

To optimize PHP code execution and avoid unexpected outcomes, it is essential to follow best practices such as using efficient algorithms, minimizing database queries, enabling caching mechanisms, and avoiding unnecessary function calls. Additionally, utilizing opcode caching, optimizing loops, and reducing the use of global variables can also improve performance.

// Example of optimizing PHP code execution by enabling opcode caching
// Enable opcode caching in php.ini file
// opcache.enable=1
// opcache.enable_cli=1