能否根据下面的两个数组来判断趋势？
<br /> $old_rank = array(<br /> "1"=>array('uid'=>132,'use_score'=>61570),<br /> "2"=>array('uid'=>121,'use_score'=>50932),<br /> "3"=>array('uid'=>145,'use_score'=>46789),<br /> "4"=>array('uid'=>100,'use_score'=>39089),<br /> "5"=>array('uid'=>167,'use_score'=>29089)<br /> );<br /> $new_rank = array(<br /> "1"=>array('uid'=>132,'use_score'=>61570),<br /> "2"=>array('uid'=>145,'use_score'=>51932),<br /> "3"=>array('uid'=>121,'use_score'=>50932),<br /> "4"=>array('uid'=>167,'use_score'=>40089),<br /> "5"=>array('uid'=>100,'use_score'=>39089)<br /> );<br />
