php - Yii 中的 CMap::mergeArray

Question

我知道 Yii 中的 CMap::mergeArray 合并两个数组。但是我有三个数组，我想让它们通过 CMap::mergeArray 合并。那么如何在 Yii 框架中合并所有三个数组。

Answer 1

这取决于你想要什么。需要注意的主要区别是 CMap 将覆盖现有键，这与内置的 php 函数不同:

If each array has an element with the same string key value, the latter will overwrite the former (different from array_merge_recursive)

如果你像上面那样执行 CMap::mergeWith，你只会得到一个由 3 个数组作为子元素组成的新数组:

例如，给定以下结构:

$foo = array (
    'a' => 1,
    'b' => 2,
    'c' => 3,
    'z' => 'does not exist in other arrays',
    );

$bar = array (
    'a' => 'one',
    'b' => 'two', 
    'c' => 'three',
);

$arr = array (
    'a' => 'uno',
    'b' => 'dos',
    'c' => 'tres',
);

使用 CMap::mergeWith 如下:

$map = new CMap();
$map->mergeWith (array($foo, $bar, $arr));
print_r($map);

结果如下:

CMap Object
(
    [_d:CMap:private] => Array
        (
            [0] => Array
                (
                    [a] => 1
                    [b] => 2
                    [c] => 3
                    [z] => does not exist in other arrays
                )

            [1] => Array
                (
                    [a] => one
                    [b] => two
                    [c] => three
                )

            [2] => Array
                (
                    [a] => uno
                    [b] => dos
                    [c] => tres
                )

        )

    [_r:CMap:private] => 
    [_e:CComponent:private] => 
    [_m:CComponent:private] => 
)

如果覆盖元素是首选行为，那么以下将起作用:

$map = new CMap ($foo);
$map->mergeWith ($bar);
$map->mergeWith ($arr);
print_r($map);

结果是:

CMap Object
(
    [_d:CMap:private] => Array
        (
            [a] => uno
            [b] => dos
            [c] => tres
            [z] => does not exist in other arrays
        )

    [_r:CMap:private] => 
    [_e:CComponent:private] => 
    [_m:CComponent:private] => 
)

但是，如果您想要附加数据，则:

$map = new CMap (array_merge_recursive ($foo, $bar, $arr));
print_r($map);

会带你到那里:

CMap Object
(
    [_d:CMap:private] => Array
        (
            [a] => Array
                (
                    [0] => 1
                    [1] => one
                    [2] => uno
                )

            [b] => Array
                (
                    [0] => 2
                    [1] => two
                    [2] => dos
                )

            [c] => Array
                (
                    [0] => 3
                    [1] => three
                    [2] => tres
                )

            [z] => does not exist in other arrays
        )

    [_r:CMap:private] => 
    [_e:CComponent:private] => 
    [_m:CComponent:private] => 
)