PHP中的多维数组-添加额外的维度

Question

$counter = 0;
foreach($dates as $dbRow) :
$datesExp[] = [$counter => array($dbRow->e_id => new DateTime($dbRow->l_date_expect))];
++$counter;
endforeach;

使用上面的代码，我试图实现的是一个数组的格式:

0 => array(
    PK => DATE)
1 => array(
    PK2 => DATE2)
....etc

但是我用var_dump得到的是:

array (size=3)
    0 => 
    array (size=1)
      0 => 
        array (size=1)
          2 => 
            object(DateTime)[7]

Where is this:array (size=1) 0=>中间维度从何而来?

Answer 1

From here: $datesExp[] = [$counter => array($dbRow->e_id => new DateTime($dbRow->l_date_expect))];

$datesExp[] = =在数组中添加以下条目

[...]; =这里的一切都是数组

array($dbRow->e_id => new DateTime($dbRow->l_date_expect)) =最里面的数组

应该

$datesExp[$counter] = array($dbRow->e_id => new DateTime($dbRow->l_date_expect));

Answer 2

试试这个，不需要单独的计数器，不需要外部大括号[..]

$datesExp[] = array($dbRow->e_id => new DateTime($dbRow->l_date_expect));