可否根据下面的两个数组来判断趋势

能否根据下面的两个数组来判断趋势？

      

               $old_rank = array(

			"1"=>array('uid'=>132,'use_score'=>61570),

			"2"=>array('uid'=>121,'use_score'=>50932),

			"3"=>array('uid'=>145,'use_score'=>46789),

			"4"=>array('uid'=>100,'use_score'=>39089),

			"5"=>array('uid'=>167,'use_score'=>29089)

		);

		$new_rank = array(

			"1"=>array('uid'=>132,'use_score'=>61570),

			"2"=>array('uid'=>145,'use_score'=>51932),

			"3"=>array('uid'=>121,'use_score'=>50932),

			"4"=>array('uid'=>167,'use_score'=>40089),

			"5"=>array('uid'=>100,'use_score'=>39089)

		);

这样的两个数组，怎么进行比对得出排名的趋势，比如用户145排名上升一位了，121排名下降一位了，132排名保持不变。 php

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------解决方案--------------------

$old_rank = array(

  "1"=>array('uid'=>132,'use_score'=>61570),

  "2"=>array('uid'=>121,'use_score'=>50932),

  "3"=>array('uid'=>145,'use_score'=>46789),

  "4"=>array('uid'=>100,'use_score'=>39089),

  "5"=>array('uid'=>167,'use_score'=>29089)

);

$new_rank = array(

  "1"=>array('uid'=>132,'use_score'=>61570),

  "2"=>array('uid'=>145,'use_score'=>51932),

  "3"=>array('uid'=>121,'use_score'=>50932),

  "4"=>array('uid'=>167,'use_score'=>40089),

  "5"=>array('uid'=>100,'use_score'=>39089)

);

foreach($old_rank as $k=>$v) $old[$v['uid']] = $k;

foreach($new_rank as $k=>$v) $new[$v['uid']] = $k;



foreach($new as $k=>$v)

  echo "$k 排名 $v " . ($v - $old[$k]) . '
';

132 排名 1 0
145 排名 2 -1
121 排名 3 1
167 排名 4 -1
100 排名 5 1