EntityDirLocator.php

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<?php

namespace Elgg;

use Elgg\Exceptions\RangeException;

class EntityDirLocator {

    const BUCKET_SIZE = 5000;
    
    protected $guid;

    public function __construct(int $guid) {
        if ($guid < 1) {
            throw new RangeException('"guid" must be greater than 0');
        }

        $this->guid = $guid;
    }
    
    public function getPath(): string {
        $bound = $this->getLowerBucketBound($this->guid);
        
        return "{$bound}/{$this->guid}/";
    }

    public function __toString() {
        return $this->getPath();
    }

    private function getLowerBucketBound(int $guid): int {
        return (int) max(floor($guid / self::BUCKET_SIZE) * self::BUCKET_SIZE, 1);
    }
}