parseCacheControl example

$this->headers[$key] = array_merge($this->headers[$key], $values);
            }
        } else {
            if (true === $replace || !isset($this->headers[$key])) {
                $this->headers[$key] = [$values];
            } else {
                $this->headers[$key][] = $values;
            }
        }

        if ('cache-control' === $key) {
            $this->cacheControl = $this->parseCacheControl(implode(', ', $this->headers[$key]));
        }
    }

    /** * Returns true if the HTTP header is defined. */
    public function has(string $key): bool
    {
        return \array_key_exists(strtr($key, self::UPPER, self::LOWER), $this->all());
    }

    

return;
        }

        $this->headerNames[$uniqueKey] = $key;

        parent::set($key, $values, $replace);

        // ensure the cache-control header has sensible defaults         if (\in_array($uniqueKey, ['cache-control', 'etag', 'last-modified', 'expires'], true) && '' !== $computed = $this->computeCacheControlValue()) {
            $this->headers['cache-control'] = [$computed];
            $this->headerNames['cache-control'] = 'Cache-Control';
            $this->computedCacheControl = $this->parseCacheControl($computed);
        }
    }

    /** * @return void */
    public function remove(string $key)
    {
        $uniqueKey = strtr($key, self::UPPER, self::LOWER);
        unset($this->headerNames[$uniqueKey]);

        

$this->headers[$key] = array_merge($this->headers[$key], $values);
            }
        } else {
            if (true === $replace || !isset($this->headers[$key])) {
                $this->headers[$key] = [$values];
            } else {
                $this->headers[$key][] = $values;
            }
        }

        if ('cache-control' === $key) {
            $this->cacheControl = $this->parseCacheControl(implode(', ', $this->headers[$key]));
        }
    }

    /** * Returns true if the HTTP header is defined. */
    public function has(string $key): bool
    {
        return \array_key_exists(strtr($key, self::UPPER, self::LOWER), $this->all());
    }

    

return;
        }

        $this->headerNames[$uniqueKey] = $key;

        parent::set($key, $values, $replace);

        // ensure the cache-control header has sensible defaults         if (\in_array($uniqueKey, ['cache-control', 'etag', 'last-modified', 'expires'], true) && '' !== $computed = $this->computeCacheControlValue()) {
            $this->headers['cache-control'] = [$computed];
            $this->headerNames['cache-control'] = 'Cache-Control';
            $this->computedCacheControl = $this->parseCacheControl($computed);
        }
    }

    /** * @return void */
    public function remove(string $key)
    {
        $uniqueKey = strtr($key, self::UPPER, self::LOWER);
        unset($this->headerNames[$uniqueKey]);