php 往数组里添加数组

$array1 = ['a', 'b', 'c'];
$array2 = ['d', 'e', 'f'];

// 添加 $array2 到 $array1 的末尾
$array1[] = $array2;

print_r($array1);

Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => Array
        (
            [0] => d
            [1] => e
            [2] => f
        )
)

$array1 = ['a', 'b', 'c'];
$array2 = ['d', 'e', 'f'];

// 添加 $array2 到 $array1 的末尾
array_push($array1, $array2);

print_r($array1);

$array1 = ['a', 'b', 'c'];
$array2 = ['d', 'e', 'f'];

// 直接将 $array2 赋值给 $array1 的一个键
$array1['newArray'] = $array2;

print_r($array1);

Array
(
    [0] => a
    [1] => b
    [2] => c
    [newArray] => Array
        (
            [0] => d
            [1] => e
            [2] => f
        )
)

$array1 = ['a', 'b', 'c'];
$array2 = ['d', 'e', 'f'];

// 错误地使用了索引
$array1[3] = $array2;

print_r($array1);

Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => Array
        (
            [0] => d
            [1] => e
            [2] => f
        )
)

$array1 = ['a', 'b', 'c'];
$array2 = ['d', 'e', 'f'];

// 正确地使用 [] 操作符
$array1[] = $array2;

print_r($array1);