Как вставить новую пару ключевых значений в массив в php?

У меня есть массив следующим образом: $test_package_data . Для справки я печатаю первые два элемента:

 Array ( [0] => Array ( [test_pack_id] => 9f27643023a83addd5eed41c4aade840 [test_pack_name] => Exams Combo [test_pack_desc] => This Package contains 24 tests of Reasoning, English and Quantitative Aptitude. Total Tests in this Package : 26 [test_pack_type_id] => 3 [test_pack_image] => [test_pack_validity_year] => 0 [test_pack_validity_month] => 3 [test_pack_validity_days] => 0 [test_pack_plan] => paid [test_pack_price] => 399.00 [test_pack_no_tests] => 0 [test_pack_publish] => yes [test_pack_sold] => 1 [test_pack_created_staff_id] => ff8d4a5ea6bf11dce105aa2fa7b959b8 [test_pack_updated_staff_id] => 81c4e3607c7e56bbf5461ef150437675 [test_pack_created_date] => 303 [test_pack_updated_date] => 1349235701 [test_pack_purchase_date] => 255 [category_detail] => Array ( [0] => Array ( [test_pack_category_id] => 8 [category_name] => English Language [test_detail] => Array ( [0] => Array ( [test_id] => 91 [test_name] => English Language 8 ) [1] => Array ( [test_id] => 90 [test_name] => English Language 7 ) [2] => Array ( [test_id] => 88 [test_name] => English Language 6 ) [3] => Array ( [test_id] => 89 [test_name] => English Language 5 ) [4] => Array ( [test_id] => 87 [test_name] => English Language 4 ) [5] => Array ( [test_id] => 86 [test_name] => English Language 3 ) [6] => Array ( [test_id] => 85 [test_name] => English Language 2 ) [7] => Array ( [test_id] => 97 [test_name] => English Language 1 ) ) ) [1] => Array ( [test_pack_category_id] => 4 [category_name] => All Subjects [test_detail] => Array ( [0] => Array ( [test_id] => 93 [test_name] => Mega 2 ) [1] => Array ( [test_id] => 92 [test_name] => Mega 1 ) ) ) [2] => Array ( [test_pack_category_id] => 7 [category_name] => Quantitative Aptitude [test_detail] => Array ( [0] => Array ( [test_id] => 83 [test_name] => Quantitative Aptitude 8 ) [1] => Array ( [test_id] => 82 [test_name] => Quantitative Aptitude 7 ) [2] => Array ( [test_id] => 81 [test_name] => Quantitative Aptitude 6 ) [3] => Array ( [test_id] => 80 [test_name] => Quantitative Aptitude 5 ) [4] => Array ( [test_id] => 79 [test_name] => Quantitative Aptitude 4 ) [5] => Array ( [test_id] => 78 [test_name] => Quantitative Aptitude 3 ) [6] => Array ( [test_id] => 77 [test_name] => Quantitative Aptitude 2 ) [7] => Array ( [test_id] => 76 [test_name] => Quantitative Aptitude 1 ) ) ) [3] => Array ( [test_pack_category_id] => 6 [category_name] => Logical Reasoning [test_detail] => Array ( [0] => Array ( [test_id] => 75 [test_name] => Reasoning 8 ) [1] => Array ( [test_id] => 74 [test_name] => Reasoning 7 ) [2] => Array ( [test_id] => 73 [test_name] => Reasoning 6 ) [3] => Array ( [test_id] => 72 [test_name] => Reasoning 5 ) [4] => Array ( [test_id] => 71 [test_name] => Reasoning 4 ) [5] => Array ( [test_id] => 70 [test_name] => Reasoning 3 ) [6] => Array ( [test_id] => 69 [test_name] => Reasoning 2 ) [7] => Array ( [test_id] => 68 [test_name] => Reasoning 1 ) ) ) ) ) [1] => Array ( [test_pack_id] => e7e95de96987cc7c89c1f0183110fb38 [test_pack_name] => Aptitude Reasoning [test_pack_desc] => This package contains 8 tests on Reasoning. [test_pack_type_id] => 3 [test_pack_image] => [test_pack_validity_year] => 0 [test_pack_validity_month] => 3 [test_pack_validity_days] => 0 [test_pack_plan] => free [test_pack_price] => 0.00 [test_pack_no_tests] => 0 [test_pack_publish] => yes [test_pack_sold] => 4 [test_pack_created_staff_id] => ff8d4a5ea6bf11dce105aa2fa7b959b8 [test_pack_updated_staff_id] => ff8d4a5ea6bf11dce105aa2fa7b959b8 [test_pack_created_date] => 303 [test_pack_updated_date] => 1347127387 [test_pack_purchase_date] => 110 [category_detail] => Array ( [0] => Array ( [test_pack_category_id] => 6 [category_name] => Logical Reasoning [test_detail] => Array ( [0] => Array ( [test_id] => 75 [test_name] => Reasoning 8 ) [1] => Array ( [test_id] => 74 [test_name] => Reasoning 7 ) [2] => Array ( [test_id] => 73 [test_name] => Reasoning 6 ) [3] => Array ( [test_id] => 72 [test_name] => Reasoning 5 ) [4] => Array ( [test_id] => 71 [test_name] => Reasoning 4 ) [5] => Array ( [test_id] => 70 [test_name] => Reasoning 3 ) [6] => Array ( [test_id] => 69 [test_name] => Reasoning 2 ) [7] => Array ( [test_id] => 68 [test_name] => Reasoning 1 ) ) ) ) ) ) 

Теперь я хочу добавить новую пару ключевых значений с именем [count] => '$some_value' в этом массиве в каждом элементе после пары ключ-значение [test_pack_purchase_date] (скажем, после [test_pack_purchase_date] => 255 Как мне сделать это может помочь мне в этом отношении? Спасибо заранее.

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 foreach($test_package_data as $key=>$data ) { $category_detail_arr = $test_package_data[$key]['category_detail']; foreach( $category_detail_arr as $i=>$value ) { $test_package_data[$key]['category_detail'][$i]['count'] = $some_value;////<----Here } }