重新构建PHP数组以基于数组元素对记录进行分组

可以使用PHP中的array_reduce函数和array_push函数来实现。下面是示例代码：

function groupRecordsByElement($records, $element) {
    $result = array_reduce($records, function($carry, $record) use ($element) {
        $key = $record[$element];
        if (!array_key_exists($key, $carry)) {
            $carry[$key] = array();
        }
        array_push($carry[$key], $record);
        return $carry;
    }, array());
    return $result;
}

// 示例数据
$records = array(
    array("id" => 1, "name" => "Alice", "group" => "A"),
    array("id" => 2, "name" => "Bob", "group" => "B"),
    array("id" => 3, "name" => "Charlie", "group" => "A"),
    array("id" => 4, "name" => "David", "group" => "B"),
    array("id" => 5, "name" => "Eve", "group" => "C")
);

// 按照"group"元素对记录进行分组
$groupedRecords = groupRecordsByElement($records, "group");

print_r($groupedRecords);

输出结果如下：

Array
(
    [A] => Array
        (
            [0] => Array
                (
                    [id] => 1
                    [name] => Alice
                    [group] => A
                )

            [1] => Array
                (
                    [id] => 3
                    [name] => Charlie
                    [group] => A
                )

        )

    [B] => Array
        (
            [0] => Array
                (
                    [id] => 2
                    [name] => Bob
                    [group] => B
                )

            [1] => Array
                (
                    [id] => 4
                    [name] => David
                    [group] => B
                )

        )

    [C] => Array
        (
            [0] => Array
                (
                    [id] => 5
                    [name] => Eve
                    [group] => C
                )

        )

)

这段代码将示例数据按照"group"元素的值进行分组，返回一个新的数组。每个分组的值作为键，对应的记录数组作为值。可以看到，记录被正确地按照"group"元素进行了分组。