向内部数组添加键值对

Question

I already have data in array as

 $a = array (
     [2011-07-09] => array(['new'] => 12),
     [2011-07-10] => array(['new'] => 15)
 );

Now I want to add another key-value pair to inner array so that output will be like

 $a = array (
     [2011-07-09] => array(['new'] => 12, ['recurring'] => 52),
     [2011-07-10] => array(['new'] => 15, ['recurring'] => 80)
 );

How can I do this?

Answer 1

$a['2011-07-09']['recurring'] = 52;
$a['2011-07-10']['recurring'] = 80;