为什么 array_push() 将我的数组数据转换为整数？ [重复]

Question

我试图找到以下问题的简单答案，但失败了。

我有一个 2D 数组和一个 1D 数组：

$arr_2D = array(
    array("product" => "apple", "quantity" => 2),
    array("product" => "Orange", "quantity" => 4),
    array("product" => "Banana", "quantity" => 5),
    array("product" => "Mango", "quantity" => 7)
);

$element = array("product" => "Lemon", "quantity" => 9);

我希望将一维数组推入二维数组，并得到一个新的大二维数组：

$arr_2D = array(
    array("product" => "apple", "quantity" => 2),
    array("product" => "Orange", "quantity" => 4),
    array("product" => "Banana", "quantity" => 5),
    array("product" => "Mango", "quantity" => 7),
    array("product" => "Lemon", "quantity" => 9)
);

我尝试过：

$arr_2D = array_push($arr_2D, $element);

但它不起作用；它返回

5

。

如何使用

array_push()

？

Answer 1

这是你想要的吗？

array_push()

和简写

[]

表示法都会将

$element

数组添加到

$arr_2D

数组的末尾 :

$arr_2D = array(
    array("product" => "apple", "quantity" => 2),
    array("product" => "Orange", "quantity" => 4),
    array("product" => "Banana", "quantity" => 5),
    array("product" => "Mango", "quantity" => 7)
);

$element = array("product" => "Lemon", "quantity" => 9);

//using array_push()
array_push($arr_2D, $element);

//using shorthand notation
$arr_2D[] = $element;

//printing the updated 2D array
print_r($arr_2D);

输出：

Array
(
    [0] => Array
        (
            [product] => apple
            [quantity] => 2
        )

    [1] => Array
        (
            [product] => Orange
            [quantity] => 4
        )

    [2] => Array
        (
            [product] => Banana
            [quantity] => 5
        )

    [3] => Array
        (
            [product] => Mango
            [quantity] => 7
        )

    [4] => Array
        (
            [product] => Lemon
            [quantity] => 9
        )
)