删除数组中的重复项并在相同索引上附加值php

Question

在我的情况下，我想根据两个键即 a 和 b 删除重复项，并且需要在第三个键 i-e c 中附加值，并且结果数组应该类似于索引 a 和 b 处的值应该是非重复的并且值第三个索引将附加到新数组中。示例数组如下所示： 我有以下数组：

数组 ( [0] => 数组 ( [一] => 0 [b] => 0 [c] => 123 )

[1] => Array
    (
        [a] => 1
        [b] => 0
        [c] => 43134
    )

[2] => Array
    (
        [a] => 0
        [b] => 4
        [c] => 5423
    )

[3] => Array
    (
        [a] => 0
        [b] => 3
        [c] => 2342
    )

[4] => Array
    (
        [a] => 0
        [b] => 0
        [c] => 123
    )

[5] => Array
    (
        [a] => 1
        [b] => 0
        [c] => 43134
    )

[6] => Array
    (
        [a] => 0
        [b] => 4
        [c] => 5423
    )

[7] => Array
    (
        [a] => 0
        [b] => 3
        [c] => 2342
    )

)

我想要这样的结果：

数组 ( [0] => 数组 ( [一] => 0 [b] => 0 [c] => 数组 ( [0] => 123 [1] => 123 )

    )

[1] => Array
    (
        [a] => 1
        [b] => 0
        [c] => Array
            (
                [0] => 43134
                [1] => 43134
            )

    )

[2] => Array
    (
        [a] => 0
        [b] => 4
        [c] => Array
            (
                [0] => 5423
                [1] => 5423
            )

    )

[3] => Array
    (
        [a] => 0
        [b] => 3
        [c] => Array
            (
                [0] => 2342
                [1] => 2342
            )

    )

)

Answer 1

遍历数组，跟踪已经看到的元素，如果您之前已经看到过该元素（a/b 组合），则将“c”元素附加到原始数组 - 作为函数 - 使用 $flattened如果您不想将其填充到函数中，请直接使用。

$result = array();

for ($i = 0; $i < count($arr); $i++)
{
    $a = $arr[$i]['a'];
    $b = $arr[$i]['b'];

    if (isset($result[$a][$b]))
    {
        // append the 'c' value
        $result[$a][$b]['c'][] = $arr[$i]['c'];
        // we've already seen the a/b combo
        continue;
    }

    // convert 'c' key to an array
    $arr[$i]['c'] = array($arr[$i]['c']);

    // keep the result
    $result[$a][$b] = $arr[$i];
}

$flattened = array();

// flatten the a/b structure to only keep the elements themselves
foreach ($result as $a => $b_level) {
    foreach ($b_level as $b => $element) {
        $flattened[] = $element;
    }
}

return $flattened;