src/Guzzle/Http/Message/Header/CacheControl.php
public function getDirective($param)
    {
        $directives = $this->getDirectives();

        return isset($directives[$param]) ? $directives[$param] : null;
    }
public function getDirective($param)
    {
        $directives = $this->getDirectives();

        return isset($directives[$param]) ? $directives[$param] : null;
    }
public function getDirective ( $ param ) { $ directives = $ this -> getDirectives ( ) ; return isset ( $ directives [ $ param ] ) ? $ directives [ $ param ] : null ; }
Get a specific cache control directive

@param string $param Directive to retrieve

@return string|bool|null
Get a specific cache control directive