Yii中的CMap :: mergeArray

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,后者将覆盖前者(与array_merge_recursive不同)

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);

结果如下:

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);

会让你到那里:

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] => 
)