PHP 拆分和分组数组

Question

我很难弄清楚如何修改我的数组。原数组是这样的...

$array = array(
array(
    "fruit" => "pineapple",
    "id" => "aaa",
),
array(
    "fruit" => "orange",
    "id" => "aaa",
),
array(
    "fruit" => "apple",
    "id" => "bbb",
),
array(
    "fruit" => "pear",
    "id" => "bbb",
),
array(
    "fruit" => "peach",
    "id" => "ccc",
),
array(
    "fruit" => "melon",
    "id" => "ccc",
)
);

我需要将这个数组转换为一个键数组。例如，我希望最终结果看起来像这样...

$array = array(
"aaa" => array("pineapple", "orange"),
"bbb" => array("apple", "pear"),
"ccc" => array("peach", "melon"),
);

我试图遍历数组并取出我需要的东西并重建数组，但我无法弄清楚。希望有人能帮助我。谢谢！

Answer 1

你可以通过这样创建一个新数组来实现：

$array = array(
    array(
        "fruit" => "pineapple",
        "id" => "aaa",
    ),
    array(
        "fruit" => "orange",
        "id" => "aaa",
    ),
    array(
        "fruit" => "apple",
        "id" => "bbb",
    ),
    array(
        "fruit" => "pear",
        "id" => "bbb",
    ),
    array(
        "fruit" => "peach",
        "id" => "ccc",
    ),
    array(
        "fruit" => "melon",
        "id" => "ccc",
    )
);

// empty array
$result = [];

// loop trough data
foreach($array as $value){

    // add item to the $result array. Then make the id the key and the fruit the value
    $result[$value['id']][] = $value['fruit'];

}

//print array
print_r($result);

结果会是

Array ( [aaa] => Array ( [0] => pineapple [1] => orange ) [bbb] => Array ( [0] => apple [1] => pear ) [ccc] => Array ( [0] => peach [1] => melon ) )

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