ARC2::getPreferredFormat PHP Метод

    static function getPreferredFormat($default = 'plain')
    {
        ARC2::inc('getPreferredFormat');
        return ARC2_getPreferredFormat($default);
    }

 public function testGetPreferredFormat()
 {
     $_SERVER['HTTP_ACCEPT'] = '';
     $actual = ARC2::getPreferredFormat('xml');
     $this->assertEquals('XML', $actual);
     $actual = ARC2::getPreferredFormat('foo');
     $this->assertEquals(null, $actual);
     $_SERVER['HTTP_ACCEPT'] = 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8';
     $actual = ARC2::getPreferredFormat();
     $this->assertEquals('HTML', $actual);
     $_SERVER['HTTP_ACCEPT'] = 'application/rdf+xml,text/html;q=0.9,*/*;q=0.8';
     $actual = ARC2::getPreferredFormat();
     $this->assertEquals('RDFXML', $actual);
 }