$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]) . '
';
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]) . '
';
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
楼上正解