为什么下面的代码显示不支持的操作数类型错误？

Question

为什么以下代码显示此错误？

Xdebug: Fatal error: Unsupported operand types in C:\wamp\www\wordpress\wp-content\themes\testtheme\single-football_league.php on line 63.

foreach (array_keys($team_points + $team_points2) as $key) { 
     $total_points_final[$key] = (isset($team_points[$key]) ? $team_points[$key] : 0) + (isset($team_points2[$key]) ? $team_points2[$key] : 0); 
    } 

Answer 1

你们是不是来连接$ team_points和$ team_points2？如果是这样，你应该使用array_merge：http://php.net/manual/en/function.array-merge.php

foreach (array_keys(array_merge($team_points, $team_points2)) as $key) { 
     $total_points_final[$key] = (isset($team_points[$key]) ? $team_points[$key] : 0) + (isset($team_points2[$key]) ? $team_points2[$key] : 0); 
    }