1

我正在尝试将数组插入到特定位置的二维数组中。根据手册，我应该可以使用 array_splice() 来执行此操作，但它只会删除我的接收数组的内容而不插入。

我想得到一个包含 $receivingArray 的所有值（数组）加上新值（数组）的数组。

我究竟做错了什么？？

手册信息：

数组 array_splice ( 数组 &$input , int $offset [, int $length [, mixed $replacement = array() ]] )

如果指定了长度并且为零，则不会删除任何元素。如果替换只是一个元素，则无需将 array() 放在 > 它周围，除非该元素是数组本身、对象或 NULL。

输入：

$newArray = array_splice($receivingArray, 0, 0, array($value));

结果：$newArray 是一个空数组

输入 ：

$newArray = array_splice($receivingArray, 1, 0, array($value));

结果：$newArray 是一个空数组

这个输入：

print_r($receivingArray);
print_r(array($value));
$newArray = array_splice($receivingArray, 1, 1, array($value));
print_r($newArray);

给出：（有趣）

Array
(
    [0] => Array
        (
            [id] => 1
            [primaryID] => 0
            [category_id] => 1
            [title] => sports
            [description] => 
            [selected] => 
            [level] => 0
        )

    [1] => Array
        (
            [id] => 4
            [primaryID] => 0
            [category_id] => 0
            [title] => programming
            [description] => 
            [selected] => 
            [level] => 0
        )

)
Array
(
    [0] => Array
        (
            [id] => 2
            [primaryID] => 1
            [category_id] => 1
            [title] => soccer
            [description] => 
            [selected] => 
            [level] => 1
        )

)
Array
(
    [0] => Array
        (
            [id] => 4
            [primaryID] => 0
            [category_id] => 0
            [title] => programming
            [description] => 
            [selected] => 
            [level] => 0
        )

)
4

2 回答 2

3

从文档中array_splice()

返回值

返回由提取的元素组成的数组。

$newArray = array_splice($receivingArray, 0, 0, array($value));

array_splice 修改它的输入，所以你正在寻找的结果在$receivingArray而不是$newArray

于 2015-05-29T02:38:52.593 回答
1

我错过了 array_slice() 实际上并没有返回它的输出，而是作用于接收数组本身的事实，它是通过引用传递的。我没有注意到手册规范中第一个参数前面有一个＆符号。

这个输入：

print_r($receivingArray);
print_r(array($value));
array_splice($receivingArray, 0, 0, array($value));
print_r($receivingArray);

给出正确的结果：

Array 
(
    [0] => Array
        (
            [id] => 1
            [primaryID] => 0
            [category_id] => 1
            [title] => sports
            [description] => 
            [selected] => 
            [level] => 0
        )

    [1] => Array
        (
            [id] => 4
            [primaryID] => 0
            [category_id] => 0
            [title] => programming
            [description] => 
            [selected] => 
            [level] => 0
        )

)
Array
(
    [0] => Array
        (
            [id] => 2
            [primaryID] => 1 
            [category_id] => 1
            [title] => soccer
            [description] => 
            [selected] => 
            [level] => 1
        )

)
Array
(
    [0] => Array
        (
            [id] => 1
            [primaryID] => 0
            [category_id] => 1
            [title] => sports
            [description] => 
            [selected] => 
            [level] => 0
        )

    [1] => Array
        (
            [id] => 2
            [primaryID] => 1
            [category_id] => 1
            [title] => soccer
            [description] => 
            [selected] => 
            [level] => 1
        )

    [2] => Array
        (
            [id] => 4
            [primaryID] => 0
            [category_id] => 0
            [title] => programming
            [description] => 
            [selected] => 
            [level] => 0
        )

)
于 2015-05-29T03:02:12.547 回答