CakeRequest::_base PHP Method

    protected function _base()
    {
        $dir = $webroot = null;
        $config = Configure::read('App');
        extract($config);
        if (!isset($base)) {
            $base = $this->base;
        }
        if ($base !== false) {
            $this->webroot = $base . '/';
            return $this->base = $base;
        }
        if (!$baseUrl) {
            $base = dirname(env('PHP_SELF'));
            // Clean up additional / which cause following code to fail..
            $base = preg_replace('#/+#', '/', $base);
            $indexPos = strpos($base, '/webroot/index.php');
            if ($indexPos !== false) {
                $base = substr($base, 0, $indexPos) . '/webroot';
            }
            if ($webroot === 'webroot' && $webroot === basename($base)) {
                $base = dirname($base);
            }
            if ($dir === 'app' && $dir === basename($base)) {
                $base = dirname($base);
            }
            if ($base === DS || $base === '.') {
                $base = '';
            }
            $base = implode('/', array_map('rawurlencode', explode('/', $base)));
            $this->webroot = $base . '/';
            return $this->base = $base;
        }
        $file = '/' . basename($baseUrl);
        $base = dirname($baseUrl);
        if ($base === DS || $base === '.') {
            $base = '';
        }
        $this->webroot = $base . '/';
        $docRoot = env('DOCUMENT_ROOT');
        $docRootContainsWebroot = strpos($docRoot, $dir . DS . $webroot);
        // CUSTOMIZE MODIFY 2013/11/25 ryuring
        // BC_DEPLOY_PATTERN が 2 の場合は、上位階層に、app/webroot/ という階層を持たない為、
        // $this->webroot に、 app/webroot/ を付加しない
        // >>>
        //if (!empty($base) || !$docRootContainsWebroot) {
        // ---
        if ((!empty($base) || !$docRootContainsWebroot) && BC_DEPLOY_PATTERN != 2) {
            // <<<
            if (strpos($this->webroot, '/' . $dir . '/') === false) {
                $this->webroot .= $dir . '/';
            }
            if (strpos($this->webroot, '/' . $webroot . '/') === false) {
                $this->webroot .= $webroot . '/';
            }
        }
        return $this->base = $base . $file;
    }