PHP - 解决方法数组的未定义索引

Question

I'm trying to simply add +1 to an array like this

$game['teamA']['goals']++;

But then it'll throw me an error about undefined index. And I guess that's because $game['teamA']['goals'] is not set before I am adding a value to it.

But isn't there a way to workaround this?

I could set the $game['teamA']['goals'] = 0 in start of simulation, but then I have to do that with freekicks, penalties, cards etc., AND do it for both teams. Isn't there another way of doing this?

Thanks in advance :)

Answer 1

You should ALWAYS initialise variables before they are used. One way to do this would be:

$game = array('teamA' => 
                  array(
                      'goals' => 0,
                      'freekicks' => 0,
                      'penalties' => 0,
                      ....
                  ),
              'teamB' =>
                  array(
                      'goals' => 0,
                      'freekicks' => 0,
                      'penalties' => 0,
                      ...
                  )
              );