RandomBlock template

Optimized.php

<?php
declare(strict_types=1);

namespace ShutTheFuckUp;

use InvalidArgumentException;
use pocketmine\block\Block;
use pocketmine\block\VanillaBlocks;

class RandomBlock {
    /** @var array */
    protected array $cumulativeArray = [];

    /** @var Block[] */
    protected array $block_list;
    /** @var int[] */
    protected array $percent_list;

    public function __construct(){
        // Define the blocks and their respective percentages
        $this->block_list = [
            'DIRT' => VanillaBlocks::DIRT(),
            'STONE' => VanillaBlocks::STONE(),
            'COAL_ORE' => VanillaBlocks::COAL_ORE()
        ];
        $this->percent_list = [
            'DIRT' => 20,  // 20% DIRT
            'STONE' => 70, // 70% STONE
            'COAL_ORE' => 10 // 10% COAL ORE
        ];

        // Validate the sum of percentages
        if (array_sum($this->percent_list) !== 100){
            throw new InvalidArgumentException("Total of percent must be = 100");
        }

        $this->generateCumulativeArray();
    }

    private function generateCumulativeArray() : void{
        $cumulative = 0;
        foreach($this->block_list as $name => $block){
            $cumulative += $this->percent_list[$name];
            $this->cumulativeArray[] = [$cumulative, $block];
        }
    }

    public function get() : Block{
        $rand = mt_rand(1, 100);
        foreach ($this->cumulativeArray as [$percent, $block]) {
            if ($rand <= $percent) {
                return $block;
            }
        }
        // This point should never be reached because the percentages sum to 100
        throw new RuntimeException("Failed to retrieve a block");
    }
}