PHP如何合并一个或多个数组

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PHP 合并数组

php 提供了多种方法来合并一个或多个数组：

array_merge() 函数

array_merge() 函数是合并数组的最简单方法。它将多个数组合并成一个新数组。

$arr1 = [1, 2, 3];
$arr2 = ["a", "b", "c"];

$mergedArr = array_merge($arr1, $arr2);

print_r($mergedArr); // 输出 [1, 2, 3, "a", "b", "c"]

+ 运算符

+ 运算符也可以合并数组，但仅限于两个数组。

$arr1 = [1, 2, 3];
$arr2 = ["a", "b", "c"];

$mergedArr = $arr1 + $arr2;

print_r($mergedArr); // 输出 [1, 2, 3, "a", "b", "c"]

array_combine() 函数

array_combine() 函数创建一个新数组，其中一个数组的元素作为键，另一个数组的元素作为值。

$keys = ["id", "name", "age"];
$values = [1, "John", 30];

$mergedArr = array_combine($keys, $values);

print_r($mergedArr); // 输出 ["id" => 1, "name" => "John", "age" => 30]

array_map() 函数

array_map() 函数允许您将一个或多个函数应用于每个数组元素，然后返回一个新数组。这可以用于合并数组，例如将两个数组的相应元素相加。

$arr1 = [1, 2, 3];
$arr2 = ["a", "b", "c"];

$mergedArr = array_map(function($a, $b) { return $a . $b; }, $arr1, $arr2);

print_r($mergedArr); // 输出 ["1a", "2b", "3c"]

嵌套数组

如果需要合并嵌套数组，可以使用递归函数或 array_merge_recursive() 函数。

array_merge_recursive() 函数

array_merge_recursive() 函数递归合并数组，合并嵌套数组中的所有子元素。

$arr1 = [
    "name" => "John",
    "age" => 30,
    "children" => [
        ["name" => "Alice", "age" => 5],
        ["name" => "Bob", "age" => 8],
    ],
];

$arr2 = [
    "name" => "Jane",
    "age" => 35,
    "children" => [
        ["name" => "Carol", "age" => 10],
    ],
];

$mergedArr = array_merge_recursive($arr1, $arr2);

print_r($mergedArr); // 输出 [
    "name" => "Jane",
    "age" => 35,
    "children" => [
        ["name" => "Alice", "age" => 5],
        ["name" => "Bob", "age" => 8],
        ["name" => "Carol", "age" => 10],
    ],
]

递归函数

也可以使用递归函数来合并嵌套数组。

function mergeNestedArrays($arr1, $arr2) {
    foreach ($arr2 as $key => $value) {
        if (is_array($value) && isset($arr1[$key]) && is_array($arr1[$key])) {
            $arr1[$key] = mergeNestedArrays($arr1[$key], $value);
        } else {
            $arr1[$key] = $value;
        }
    }

    return $arr1;
}

$arr1 = [
    "name" => "John",
    "age" => 30,
    "children" => [
        ["name" => "Alice", "age" => 5],
        ["name" => "Bob", "age" => 8],
    ],
];

$arr2 = [
    "name" => "Jane",
    "age" => 35,
    "children" => [
        ["name" => "Carol", "age" => 10],
    ],
];

$mergedArr = mergeNestedArrays($arr1, $arr2);

print_r($mergedArr); // 输出 [
    "name" => "Jane",
    "age" => 35,
    "children" => [
        ["name" => "Alice", "age" => 5],
        ["name" => "Bob", "age" => 8],
        ["name" => "Carol", "age" => 10],
    ],
]

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