能否根据下面的两个数组来判断趋势？

php

                     $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。

回复讨论(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]) . '<br>';

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

$old_rank = array(  "1"=>array('uid'=>132,'use_score'=>61570),  "2"=>array('uid'=>121,'use_score'=>50932),  "3"=>array('uid'=>145,'use_score'=>46789),  "4"=>array('uid'=>100,'use_score'=>39089),  "5"=>array('uid'=>167,'use_score'=>29089));$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]) . '<br>';

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
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