<?php class Distribution extends SPLFixedArray { private $keyMask; public function __construct(int $digits = 1) { parent::__construct(10 ** $digits); $this->keyMask = "%0{$digits}s"; } public function current(): int { return parent::current() ?? 0; } public function key(): string { return sprintf($this->keyMask, parent::key()); } public function addValue(string $key, int $value = 1) { $this->offsetSet((int) $key, $this->offsetGet((int) $key) + $value); } } $distribution = new Distribution(4); $distribution['8'] = ($distribution['8'] ?? 0) + 1; var_dump($distribution);
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