WordPress: Automatically copied requirements folder to mu-plugin on theme activation

requireActivations.php

add_action('after_switch_theme', function() {
    $basePath = dirname(__DIR__, 3);
	$muPluginpath = dirname(__DIR__, 2) . '/mu-plugins';
	$requirementsPath = __DIR__ . '/requirements';

	require_once(  $basePath . "/wp-admin/includes/plugin.php");

	if (wp_mkdir_p($muPluginpath)) {
		$di = new RecursiveDirectoryIterator($muPluginpath, FilesystemIterator::SKIP_DOTS);
		$ri = new RecursiveIteratorIterator($di, RecursiveIteratorIterator::CHILD_FIRST);
		foreach ( $ri as $file ) {
			$file->isDir() ?  rmdir($file) : unlink($file);
		}
	}

	// extract all zip files in requirementsPath to muPluginPath
	$di = new RecursiveDirectoryIterator($requirementsPath, FilesystemIterator::SKIP_DOTS);
	$ri = new RecursiveIteratorIterator($di, RecursiveIteratorIterator::CHILD_FIRST);
	foreach ( $ri as $file ) {
		if ($file->isFile() && $file->getExtension() === 'zip') {
			$zip = new ZipArchive();
			$res = $zip->open($file);
			if ($res === true) {
				$zip->extractTo($muPluginpath);
				$zip->close();
			}
		}
	}
});