Question

我是新工作的PHP，我使用foreach循环来遍历解码对象的数组。我想为每次迭代输入一个新数组的值。这是代码的一部分：

val df = Seq(
  (1, 1, 2, 4), (1, 1, 2, 4), (1, 1, 3, 5)
).toDF("col1", "col2", "col3", "col4")


df.melt(
  Seq("col1", "col2"), Seq("col3", "col4"), "col_name", "col_value"
).groupBy("col1", "col2", "col_name", "col_value").count.show
// +----+----+--------+---------+-----+
// |col1|col2|col_name|col_value|count|
// +----+----+--------+---------+-----+
// |   1|   1|    col3|        3|    1|
// |   1|   1|    col4|        5|    1|
// |   1|   1|    col4|        4|    2|
// |   1|   1|    col3|        2|    2|
// +----+----+--------+---------+-----+

目前我正在生成一维数组，我需要的是获得这种类型的数组：

//example of array before decoding it [{"id":1,"quantity":12, other values...},{"id":2,"quantity":13,other values...}]
$data = json_decode($request->data); 
$newArray = array();

foreach ($data as $key => $value){
  $newArray[$key] = $value->{'id'} //[1,2,3....]
}

其他＆＃39;将是我从循环[ 1 => ['quantity' => $other], 2 => ['quantity' => $other] ]得到的另一个值。我怎样才能生成这个？

Answer 1

我不是100％自信，我是否真的得到了你的问题......但这可能是你想要的：

foreach ($data as $key => $value) {
    $newArray[$value->id] = ['quantity' => $value->quantity];
}

print_r($newArray);

在json_decode之后您拥有stdClass类型的对象，因此您可以访问上面显示的属性。

Answer 2

我不确定为什么在一个元素数组中需要quantity个键。如果没有这个，你可以简单地使用https://docs.angularjs.org/api/ng/directive/select函数：

$items = json_decode($json);
// $items = json_decode($json, true); // For PHP < 7.0

$result = array_column($items, 'quantity', 'id');

但如果您确定需要quantity个密钥，则可以使用array_column映射结果：

$result = array_map(function ($quantity) {
   return ['quantity' => $quantity]; 
}, $result);

这是array_map。

Answer 3

使用循环，你会做这样的事情：

$data = '[{"id":1,"quantity":12},{"id":2,"quantity":13}]';
$decoded = json_decode($data, $as_array = true); // decode as array, not object
$accumulator = [];
foreach($decoded as $index=>$values) {
    $accumulator[$values['id']] = ['quantity' => $values['quantity']];
}
print_r($accumulator);

使用array_reduce：

可以更加清晰地表达相同的概念

$data = '[{"id":1,"quantity":12},{"id":2,"quantity":13}]';
$decoded = json_decode($data, $as_array = true); // decode as array, not object
$reduced = array_reduce($decoded, function($carry, $entry){
    $carry[$entry['id']] = ['quantity' => $entry['quantity']];
    return $carry;
}, $initial_value = []);
print_r($reduced);

两种方法都会生成相同的输出：

Array
(
    [1] => Array
        (
            [quantity] => 12
        )

    [2] => Array
        (
            [quantity] => 13
        )

)

Answer 4

我认为你期待这样，

$request = new stdClass();
$request->data = '[{"id":1,"quantity":12,"name":"item 1","code":"ITM-111"},{"id":2,"quantity":13,"name":"item 2","code":"ITM-222"}]';

$data = json_decode($request->data);
$newArray = array();

print_r($data);

示例：的

Array
(
    [0] => stdClass Object
        (
            [id] => 1
            [quantity] => 12
            [name] => item 1
            [code] => ITM-111
        )

    [1] => stdClass Object
        (
            [id] => 2
            [quantity] => 13
            [name] => item 2
            [code] => ITM-222
        )

)

$other = 'name'; // required key

foreach($data as $value){
    $newArray[$value->id] = [ 
        'quantity' => $value->quantity,
        'name' => $value->{$other}
    ];
}

print_r($newArray);

输出：

Array
(
    [1] => Array
        (
            [quantity] => 12
            [name] => item 1
        )

    [2] => Array
        (
            [quantity] => 13
            [name] => item 2
        )

)

Answer 5

您可以使用简单的foreach循环

来完成

$json='[{"id":1,"quantity":12, "ov":1,"ov2":2},{"id":2,"quantity":13,"ov":"other values"}]';
echo "<pre/>";
$a=json_decode($json,TRUE);
foreach($a as $val){
    $arr=$val;
    unset($arr['id']);
    $new_arr[$val['id']]=$arr;
}
print_r($new_arr);

您的问题不明确，如果您正在尝试将数量放在密钥上，请尝试以下内容

$json='[{"id":1,"quantity":12, "ov":1,"ov2":2},{"id":2,"quantity":13,"ov":"other values"}]';
echo "<pre/>";
$a=json_decode($json,TRUE);
foreach($a as $val){
    $arr=$val;
    unset($arr['id']);
    $temp=$arr;
    unset($temp['quantity']);
    $new_arr[$val['id']]=[$arr['quantity']=>$temp];
}
print_r($new_arr);


Array
(
    [1] => Array
        (
            [12] => Array
                (
                    [ov] => 1
                    [ov2] => 2
                )

        )

    [2] => Array
        (
            [13] => Array
                (
                    [ov] => other values
                )

        )

)

Answer 6

以下是如您所述生成数组的方法。我添加了other属性的示例值以帮助说明。

    <?php
    header('Content-Type: text/plain');

    $request_data = '[{"id":1,"quantity":12,"other":"Other 1"},{"id":2,"quantity":13,"other":"Other 2"}]';

    $data = json_decode($request_data);
    $newArray = array();

    foreach ($data as $key => $value) {
      $newArray[$value->id] = array(
            'quantity' => $value->other
        );
    }

    print_r($newArray);

    // Returns:

    /*
    Array
    (
        [1] => Array
            (
                [quantity] => Other 1
            )

        [2] => Array
            (
                [quantity] => Other 2
            )

    )
    */

Answer 7

您可以使用以下内容附加数组：

foreach($file_data as $value) {
    list($value1, $value2, $value3) = explode('|', $value);
    $item = array(
        'value1' => $value1, 
        'value2' => $value2, 
        'value3' => $value3
    );
    $file_data_array[] = $item;
}

有关更多信息，请查看以下内容： Creating/modifying with square bracket syntax

将值插入循环内的关联数组中

7 个答案: