PHP二维数组输出解决办法

   $b-title = baidu;
   $b-keyword = search;
   $b-content = baidu search; 
   $g-title = google;
   $g-keyword = search;
   $g-content = google search; 
$baidu=array('baidu'=>array('$b-title','$b-keyword','$b-content'));
$google=array('google'=>array('$g-title','$g-keyword','$g-content'));
?>

$b_title = 'baidu';
	$b_keyword = 'search';
	$b_content = 'baidu search'; 
	$baidu = array('b-title'=>$b_title,'b-keyword'=>$b_keyword,'b-content'=>$b_content);
	echo http_build_query($baidu);