Memoization
Memoization is an optimisation technique to speed up a function by avoiding re-processing previously calculated results.
Usually, memoization trades processing time with memory. The best suited situation are when the load takes some time to process, and the result is a small amount of memory, such as a count.
<?php
function docs($file) {
// local cache
static $cache = [];
// If it was already cached, use it.
// Docs are supported to be constant during the execution
if (isset($cache[$file])) {
return $cache[$file];
}
$cache[$file] = file_get_contents($file) ?? '';
}
?>