扩展关联数组

Question

I would like to extend an assoc array. The original array is like

$arr = [[
  'ID'      => 0,
  'TEXT'    => SOME_CONST,
  'CHECKED' => $opt_flag,
]];

With a new condition I would like to extend this existing array.

if (defined('MODULE_STATUS') && MODULE_STATUS == 'true') {
  $arr['JSON_ATTRDATA'] = 1;
}

The result is

Array
(
    [0] => Array
        (
            [ID] => 0
            [TEXT] => text
            [CHECKED] => 1
        )

    [JSON_ATTRDATA] => 1
)

What is wrong that the new key is outside of the nestet array?

Answer 1

you want $arr[0]['JSON_ATTRDATA'] = 1; right now you appending to the parent array, you want the child array which has the key 0