Add custom modificator to fenom on modx

pdotoolscustom.class.php

<?php
// /core/model/modx/pdotools/pdotoolscustom.class.php
require_once MODX_CORE_PATH . 'components/pdotools/model/pdotools/pdotools.class.php';

class pdotoolscustom extends pdoTools {

	public function getFenom() {
		if (!$this->fenom) {
			try {
				if (!class_exists('Fenom')) {
					require MODX_CORE_PATH . 'components/pdotools/model/' . '/fenom/Fenom.php';
					require MODX_CORE_PATH . 'components/pdotools/model/' . '/fenom/Fenom/ProviderInterface.php';
					require MODX_CORE_PATH . 'components/pdotools/model/' . '/fenom/Providers/ModChunk.php';
					require MODX_CORE_PATH . 'components/pdotools/model/' . '/fenom/Providers/ModTemplate.php';
					Fenom::registerAutoload();
				}
				$cache = MODX_CORE_PATH . 'cache/';
				if (!file_exists($cache)) {
					mkdir($cache);
				}
				$this->fenom = Fenom::factory(new modChunkProvider($this), $cache);
				$this->fenom->addProvider('template', new modTemplateProvider($this));
				$default_options = array(
						'force_compile' => true,
						'disable_cache' => true,
						'force_include' => true,
				);
				if (!$this->modx->getOption('pdotools_fenom_php', null, false)) {
					$this->fenom->removeAccessor('php');
					$default_options['disable_native_funcs'] = true;
				}
				if ($options = $this->modx->fromJSON($this->modx->getOption('pdotools_fenom_options'))) {
					$options = array_merge($options, $default_options);
				}
				else {
					$options = $default_options;
				}
				$this->fenom->setOptions($options);

				$this->fenom->addModifier('days', function ($day) {
					$a=substr($day,strlen($day)-1,1);
					if($a==1) $str="день";
					if($a==2 || $a==3 || $a==4) $str="дня";
					if($a==5 || $a==6 || $a==7 || $a==8 || $a==9 || $a==0) $str="дней";
					return $str;
				});
			}
			catch (Exception $e) {
				$this->modx->log(xPDO::LOG_LEVEL_ERROR, $e->getMessage());
				return false;
			}
		}

		return $this->fenom;
	}
}