Question

我知道Yii中的CMap :: mergeArray合并了两个数组。但我有三个数组，我想通过CMap :: mergeArray使它们合并。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。要注意的关键区别是CMap将覆盖现有的密钥，这与内置的php函数不同：

如果每个数组都有一个具有相同字符串键值的元素，那么后者将覆盖前者（不同于 array_merge_recursive）

如果您按上述方法执行CMap :: mergeWith，您将获得一个由3个数组组成的新数组作为子元素：

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，则以下内容将起作用：

$map = new CMap ($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，那么：

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

会帮助你：

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] => 
)

Answer 2

使用array_merge ($ar1, $ar2, $ar3)或array_merge_recursive ($ar1, $ar2, $ar3)

你也可以使用：

CMap::mergeWith(array($ar1, $ar2, $ar3));

但我不确定前者的结果

Yii中的CMap :: mergeArray

2 个答案: