Language: PHP
Label: safe
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
                        $cache[$key] = array_merge($fallback_cache[$key], $cache[$key]);
                    }
                } else {
                    $cache[$key] = $fallback_cache[$key];
                }
            }
        }

        // save to cache for later retrieval
        $this->cache[$code] = $cache;
        return;
    }