PHP二维数组输出解决办法

<br><!--?php<br /-->   $b-title = baidu;<br>   $b-keyword = search;<br>   $b-content = baidu search; <br>   $g-title = google;<br>   $g-keyword = search;<br>   $g-content = google search; <br>$baidu=array('baidu'=>array('$b-title','$b-keyword','$b-content'));<br>$google=array('google'=>array('$g-title','$g-keyword','$g-content'));<br>?><br><br>

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