How can PHP code optimization be applied to improve the efficiency of a mini website?

To improve the efficiency of a mini website, PHP code optimization techniques can be applied. This includes minimizing the use of unnecessary functions, reducing database queries, caching data where possible, and using efficient algorithms for processing data.

// Example of optimizing PHP code by reducing unnecessary function calls
// Before optimization
$result = someFunction1();
$result2 = someFunction2($result);
$result3 = someFunction3($result2);

// After optimization
$result = someFunction1();
$result2 = someFunction3($result);