Question

我想创建一个像这样的对象数组：

[

    'A' => { 'name':'name1', 'family':'family1'},

    'B' => { 'name':'name2', 'family':'family2'},

    'C' => { 'name':'name3', 'family':'family3'},

    'D' => { 'name':'name4', 'family':'family4'},

    'E' => { 'name':'name5', 'family':'family5'},

    'F' => { 'name':'name6', 'family':'family6'},

];

我有一个数组常量名称和其他数组常量系列，因此我使用了foreach循环。但是结果是惊人的。为什么循环每个，更改所有名称和所有家庭？

$name    = [
    'A'=>'name1',
    'B'=>'name2',
    'C'=>'name3',
    'D'=>'name4',
    'E'=>'name5',
    'F'=>'name6'
];
$family  = [
    'A'=>'family1',
    'B'=>'family2',
    'C'=>'family3',
    'D'=>'family4',
    'E'=>'family5',
    'F'=>'family6'
];
$key     = array_keys( $name );
$myArray = array_fill_keys( $key, new stdClass() );

foreach( $myArray as $k => $info ){
    $myArray[$k]->name = $name[$k];
    $myArray[$k]->family = $family[$k];
}

这是结果

[

    'A' => { 'name':'name6', 'family':'family6'},

    'B' => { 'name':'name6', 'family':'family6'},

    'C' => { 'name':'name6', 'family':'family6'},

    'D' => { 'name':'name6', 'family':'family6'},

    'E' => { 'name':'name6', 'family':'family6'},

    'F' => { 'name':'name6', 'family':'family6'},

];

Answer 1

这会更简单

$name    = [
    'A'=>'name1',
    'B'=>'name2',
    'C'=>'name3',
    'D'=>'name4',
    'E'=>'name5',
    'F'=>'name6'
];
$family  = [
    'A'=>'family1',
    'B'=>'family2',
    'C'=>'family3',
    'D'=>'family4',
    'E'=>'family5',
    'F'=>'family6'
];

foreach( $name as $k => $info ){
    $t = new stdClass();
    $t->name = $info;
    $t->family = $family[$k];
    $myArray[$k] = $t;
}

结果

Array
(
    [A] => stdClass Object
        (
            [name] => name1
            [family] => family1
        )
    [B] => stdClass Object
        (
            [name] => name2
            [family] => family2
        )
    [C] => stdClass Object
        (
            [name] => name3
            [family] => family3
        )
    [D] => stdClass Object
        (
            [name] => name4
            [family] => family4
        )
    [E] => stdClass Object
        (
            [name] => name5
            [family] => family5
        )
    [F] => stdClass Object
        (
            [name] => name6
            [family] => family6
        )
)

然后，如果对它执行json_encode（），则会得到所需的内容

echo json_encode($myArray);

{
    "A": {
        "name": "name1",
        "family": "family1"
    },
    "B": {
        "name": "name2",
        "family": "family2"
    },
    "C": {
        "name": "name3",
        "family": "family3"
    },
    "D": {
        "name": "name4",
        "family": "family4"
    },
    "E": {
        "name": "name5",
        "family": "family5"
    },
    "F": {
        "name": "name6",
        "family": "family6"
    }
}

更新：为什么您的代码有问题

此行

$myArray = array_fill_keys( $key, new stdClass() );

使用对单个对象的引用填充数组。

因此，当您将数据加载到数组中的对象时，您将用一些数据填充单个对象。该对象在您所有发生的数组中都被引用（指向）。因此，您只会看到在所有数组事件中循环的最后一次迭代中加载的数据。

例如一个简单的测试

$name    = [
'A'=>'name1',
'B'=>'name2',
'C'=>'name3',
'D'=>'name4',
'E'=>'name5',
'F'=>'name6'
];
$family  = [
    'A'=>'family1',
    'B'=>'family2',
    'C'=>'family3',
    'D'=>'family4',
    'E'=>'family5',
    'F'=>'family6'
];

$key     = array_keys( $name );
$myArray = array_fill_keys( $key, new stdClass() );

// looks like it should fill only the object in the first 'A' occurance
$myArray['A']->one = 1;
print_r($myArray);

结果

Array
(
    [A] => stdClass Object ( [one] => 1 )
    [B] => stdClass Object ( [one] => 1 )
    [C] => stdClass Object ( [one] => 1 )
    [D] => stdClass Object ( [one] => 1 )
    [E] => stdClass Object ( [one] => 1 )
    [F] => stdClass Object ( [one] => 1 )
)

Answer 2

将您的foreach循环更新为如下所示：

foreach( $myArray as $k => $info ){
    $myArray[$k] = ['name' => $name[$k] , 'family' => $family[$k]];
}

Answer 3

$myArray = [];
foreach($name as $k => $v){
    $myArray[$k] = (object)['name'=>$v, 'famili'=>$family[$k]];
}

用foreach更改对象的数组值

3 个答案:

更新：为什么您的代码有问题

例如一个简单的测试