ClosureCacheExample.php

<?php 

/**
 * Let's pretend that we have this expensive
 * function that takes up to 4 seconds to run
 * and in this case, total time of execution
 * would be 8 seconds.
 *
 */ 
function buildRocket() : boolean
{
    sleep(4);
    
    return true;
}

buildRocket();
buildRocket();

/**
 * Let's wrap it up with once() helper function.
 * Total time of execution now would be only 4 seconds
 * because it cached result of the function and yes
 * it would handle different arguments passed as well.
 */
function buildRocket() : boolean
{
    return once(function () {
        sleep(4);
        
        return true;
    });
}

buildRocket();
buildRocket();