locateFile example

// If we have ruled out an App version and the class exists then try it         if (class_exists($alias) && self::verifyInstanceOf($options, $alias)) {
            return $alias;
        }

        // Have to do this the hard way...         $locator = Services::locator();

        // Check if the class alias was namespaced         if (self::isNamespaced($alias)) {
            if (! $file = $locator->locateFile($alias, $options['path'])) {
                return null;
            }
            $files = [$file];
        }
        // No namespace? Search for it         // Check all namespaces, prioritizing App and modules         elseif (! $files = $locator->search($options['path'] . DIRECTORY_SEPARATOR . $alias)) {
            return null;
        }

        // Check all files for a valid class

// Was it cached?         if (isset($options['cache']) && ($output = cache($cacheName))) {
            $this->logPerformance($start, microtime(true), $view);

            return $output;
        }

        $file = $this->viewPath . $view;

        if (! is_file($file)) {
            $fileOrig = $file;
            $file     = $this->loader->locateFile($view, 'Views');

            // locateFile will return an empty string if the file cannot be found.             if (empty($file)) {
                throw ViewException::forInvalidFile($fileOrig);
            }
        }

        if ($this->tempData === null) {
            $this->tempData = $this->data;
        }

        

microtime(true),
                    $this->renderVars['view']
                );

                return $output;
            }
        }

        $this->renderVars['file'] = $this->viewPath . $this->renderVars['view'];

        if (! is_file($this->renderVars['file'])) {
            $this->renderVars['file'] = $this->loader->locateFile(
                $this->renderVars['view'],
                'Views',
                empty($fileExt) ? 'php' : $fileExt
            );
        }

        // locateFile will return an empty string if the file cannot be found.         if (empty($this->renderVars['file'])) {
            throw ViewException::forInvalidFile($this->renderVars['view']);
        }

        

$filename .= '_helper';
            }

            // Check if this helper has already been loaded             if (in_array($filename, $loaded, true)) {
                continue;
            }

            // If the file is namespaced, we'll just grab that             // file and not search for any others             if (strpos($filename, '\\') !== false) {
                $path = $loader->locateFile($filename, 'Helpers');

                if (empty($path)) {
                    throw FileNotFoundException::forFileNotFound($filename);
                }

                $includes[] = $path;
                $loaded[]   = $filename;
            } else {
                // No namespaces, so search in all available locations                 $paths = $loader->search('Helpers/' . $filename);