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3 liveuser 1 
<?php
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namespace Guzzle\Http\Message\Header;
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use Guzzle\Http\Message\Header;
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/**
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 * Provides helpful functionality for Cache-Control headers
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 */
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class CacheControl extends Header
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{
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    /** @var array */
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    protected $directives;
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    public function add($value)
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    {
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        parent::add($value);
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        $this->directives = null;
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    }
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    public function removeValue($searchValue)
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    {
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        parent::removeValue($searchValue);
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        $this->directives = null;
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    }
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    /**
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     * Check if a specific cache control directive exists
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     *
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     * @param string $param Directive to retrieve
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     *
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     * @return bool
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     */
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    public function hasDirective($param)
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    {
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        $directives = $this->getDirectives();
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        return isset($directives[$param]);
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    }
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    /**
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     * Get a specific cache control directive
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     *
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     * @param string $param Directive to retrieve
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     *
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     * @return string|bool|null
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     */
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    public function getDirective($param)
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    {
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        $directives = $this->getDirectives();
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        return isset($directives[$param]) ? $directives[$param] : null;
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    }
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    /**
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     * Add a cache control directive
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     *
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     * @param string $param Directive to add
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     * @param string $value Value to set
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     *
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     * @return self
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     */
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    public function addDirective($param, $value)
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    {
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        $directives = $this->getDirectives();
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        $directives[$param] = $value;
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        $this->updateFromDirectives($directives);
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        return $this;
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    }
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    /**
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     * Remove a cache control directive by name
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     *
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     * @param string $param Directive to remove
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     *
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     * @return self
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     */
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    public function removeDirective($param)
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    {
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        $directives = $this->getDirectives();
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        unset($directives[$param]);
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        $this->updateFromDirectives($directives);
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        return $this;
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    }
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    /**
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     * Get an associative array of cache control directives
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     *
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     * @return array
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     */
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    public function getDirectives()
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    {
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        if ($this->directives === null) {
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            $this->directives = array();
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            foreach ($this->parseParams() as $collection) {
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                foreach ($collection as $key => $value) {
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                    $this->directives[$key] = $value === '' ? true : $value;
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                }
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            }
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        }
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        return $this->directives;
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    }
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    /**
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     * Updates the header value based on the parsed directives
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     *
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     * @param array $directives Array of cache control directives
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     */
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    protected function updateFromDirectives(array $directives)
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    {
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        $this->directives = $directives;
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        $this->values = array();
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        foreach ($directives as $key => $value) {
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            $this->values[] = $value === true ? $key : "{$key}={$value}";
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        }
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    }
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}