Less.php

<?php
namespace nizsheanez\assetConverter;

use Yii;
use yii\caching\FileCache;

class Less extends Parser
{
    public $auto = false;

    /**
     * Parse a Less file to CSS
     */
    public function parse($src, $dst, $options)
    {
        $this->auto = isset($options['auto']) ? $options['auto'] : $this->auto;
        try {
            if ($this->auto) {
                /* @var FileCache $cacheMgr */
                $cacheMgr = Yii::createObject('yii\caching\FileCache');
                $cacheMgr->init();
                $cacheId = 'less#' . $dst;
                $cache = $cacheMgr->get($cacheId);
                if ($cache === false || (@filemtime($dst) < @filemtime($src))) {
                    $cache = $src;
                }
                $less = new \lessc();
                $newCache = $less->cachedCompile($cache);

                if (!is_array($cache) || ($newCache["updated"] > $cache["updated"])) {
                    $cacheMgr->set($cacheId, $newCache);
                    file_put_contents($dst, $newCache['compiled']);
                }
            } else {
                $less = new \lessc();
                $less->compileFile($src, $dst);
            }
        } catch (Exception $e) {
            throw new Exception(__CLASS__ . ': Failed to compile less file : ' . $e->getMessage() . '.');
        }
    }
}