framework/helpers/BaseFileHelper.php
public static function filterPath($path, $options)
    {
        if (isset($options['filter'])) {
            $result = call_user_func($options['filter'], $path);
            if (is_bool($result)) {
                return $result;
            }
        }

        if (empty($options['except']) && empty($options['only'])) {
            return true;
        }

        $path = str_replace('\\', '/', $path);

        if (!empty($options['except'])) {
            if (($except = self::lastExcludeMatchingFromList($options['basePath'], $path, $options['except'])) !== null) {
                return $except['flags'] & self::PATTERN_NEGATIVE;
            }
        }

        if (!empty($options['only']) && !is_dir($path)) {
            if (($except = self::lastExcludeMatchingFromList($options['basePath'], $path, $options['only'])) !== null) {
                // don't check PATTERN_NEGATIVE since those entries are not prefixed with !
                return true;
            }

            return false;
        }

        return true;
    }
public static function filterPath($path, $options)
    {
        if (isset($options['filter'])) {
            $result = call_user_func($options['filter'], $path);
            if (is_bool($result)) {
                return $result;
            }
        }

        if (empty($options['except']) && empty($options['only'])) {
            return true;
        }

        $path = str_replace('\\', '/', $path);

        if (!empty($options['except'])) {
            if (($except = self::lastExcludeMatchingFromList($options['basePath'], $path, $options['except'])) !== null) {
                return $except['flags'] & self::PATTERN_NEGATIVE;
            }
        }

        if (!empty($options['only']) && !is_dir($path)) {
            if (($except = self::lastExcludeMatchingFromList($options['basePath'], $path, $options['only'])) !== null) {
                // don't check PATTERN_NEGATIVE since those entries are not prefixed with !
                return true;
            }

            return false;
        }

        return true;
    }
Checks if the given file path satisfies the filtering options.
@param string $path the path of the file or directory to be checked
@param array $options the filtering options. See [[findFiles()]] for explanations of
the supported options.
@return bool whether the file or directory satisfies the filtering options.