Recover a unicode to use it. (From my private project)

Unicode.php

<?php

namespace your/namespace;

use JsonException;
use pocketmine\utils\Config;
// use your/plugin/Main

class Unicode {

	/**
	 * @throws JsonException
	 */
	public function __construct(string $file) {
		if (!is_dir(Main::getInstance()->getDataFolder() . "unicodes")) mkdir(Main::getInstance()->getDataFolder() . "unicodes");

		foreach ($config as $code) {
			$this->glyph(basename($file, ".png"), new Config(Main::getInstance()->getDataFolder() . "unicodes/{$file}.yml", Config::YAML), 256);
		}
	}

	/**
	 * @param string $resource
	 * @param Config $config
	 * @param int $grid
	 * @return void
	 * @throws JsonException
	 */
	private function glyph(string $resource, Config $config, int $grid = 16): void {
		$GRID = $grid;
		$vv = $this->getArr($resource, $GRID);

		for ($a = 1; ; $a++) {
			if ($a > 256) {
				break;
			}
			$config->set($a, $vv[$a]);
		}
		$config->save();
	}

	/**
	 * @param string $filename
	 * @param int $GRID
	 * @return array
	 */
	private function getArr(string $filename, int $GRID): array {
		$startChar = hexdec(substr($filename, strrpos($filename, "_") + 1) . "00");
		$g = 0;
		$i = 0;
		do {
			$g++;
			$ci = $startChar + $i;
			$char = mb_chr($ci);
			$vv[$g] = $char;
		} while (++$i < $GRID ** 2);
		return $vv;
	}
}