如何在php中的数组中插入新的键值对？
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【中文标题】如何在php中的数组中插入新的键值对？【英文标题】：How to insert a new key value pair in array in php? 【发布时间】：2013-07-05 15:47:56 【问题描述】：我有一个名为$test_package_data 的数组，如下所示。作为参考，我打印了它的前两个元素：
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
)
)
)
)
)
)
现在我想在键值对[test_pack_purchase_date]之后的每个元素中的这个数组中添加一个名为[count] => '$some_value'的新键值对（比如[test_pack_purchase_date] => 255之后。我应该怎么做？谁能帮我在这方面？提前致谢。
【问题讨论】：
除了删除，添加，读取之外，您无法真正更改数组中的顺序。 你是如何创建数组的？ array_merge 应该有帮助 你不能，不是真的。 php assoc 数组本质上是结构。这意味着，为了对键进行排序，必须重建数组。附加密钥然后编写您自己的uksort 函数可能会起作用，或者json_encode 和str_replace-将您的新键值对放在json_decode($str, true) 之前的正确位置
【参考方案1】：
如果您要创建新数组，请尝试以下操作：
$arr = ['key' => 'value'];
如果数组已经创建，那么试试这个：
$arr['key'] = 'value';
【讨论】：
当我这样做时，我只得到最后一个元素...for($i= 1; $i<=$5; $i++) $EACH_POST_QUERY = mysql_query("SELECT item_id FROM likes WHERE item_id='$i'"); $EACH_POST_TOTAL_LIKES = mysql_num_rows($EACH_POST_QUERY); $EACH_POST_RESULT = array($i => $EACH_POST_TOTAL_LIKES);
@KalpeshSingh: 因为你每次都在创建新数组，所以用这个$EACH_POST_RESULT[] = $EACH_POST_TOTAL_LIKES; 更改最后一行我强烈建议你使用 PDO 而不是弃用的mysql_connect()，你可以找到更多关于PDOhere【参考方案2】：
添加：
$arr["key"] = "value";
然后直接返回$arr
不能这样直接返回return $arr["key"] = "value";
【讨论】：
【参考方案3】：试试这个：
foreach($array as $k => $obj)
$obj->'newKey' = "value";
【讨论】：
这个问题是关于 PHP 关联数组的，这并不能完全回答他们的问题。【参考方案4】：foreach($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
【讨论】：
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