PHP Data Mapping

Question

Я получил некоторый набор данных, и он должен быть сопоставлен, группируя дубликаты, как это:

Я имею:

<?php
$var = array(
    array("Name" => "Alfred", "Number" => 1),
    array("Name" => "Alfred", "Number" => 2),
    array("Name" => "Alfred", "Number" => 3),
    array("Name" => "Aethelstan", "Number" => 4),
    array("Name" => "Aethelstan", "Number" => 5),
    array("Name" => "Aethelstan", "Number" => 6),
)
?>

Я хочу изменить это на:

<?php
$var = array(
    array("name" => "Alfred","Number" => array(1,2,3)),
    array("name" => "Aelthestan","Number" => array(4,5,6)),
)
?>

У кого-то есть идеи без большого количества циклов и сравнений один за другим?

Answer 1

Надеюсь, это сработает.

Демонстрация кода PHP

<?php
$var = array(
    array("Name" => "Alfred", "Number" => 1),
    array("Name" => "Alfred", "Number" => 2),
    array("Name" => "Alfred", "Number" => 3),
    array("Name" => "Aethelstan", "Number" => 4),
    array("Name" => "Aethelstan", "Number" => 5),
    array("Name" => "Aethelstan", "Number" => 6),
);
$result=array();
foreach($var as $value)
{
    if(!isset($result[$value["Name"]]))
    {
        $result[$value["Name"]]=array("Name"=>$value["Name"],"Number"=>array($value["Number"]));
    }
    else
    {
        $result[$value["Name"]]["Number"][]=$value["Number"];
    }

}
$result=array_values($result);
print_r($result);

Выход:

Array
(
    [0] => Array
        (
            [Name] => Alfred
            [Number] => Array
                (
                    [0] => 1
                    [1] => 2
                    [2] => 3
                )

        )

    [1] => Array
        (
            [Name] => Aethelstan
            [Number] => Array
                (
                    [0] => 4
                    [1] => 5
                    [2] => 6
                )

        )

)

Answer 2

Вы также можете взглянуть на array_reduce для более функционального / декларативного / неизменного подхода:

<?php

$flatData = [
  ['name' => 'foo', 'number' => 1],
  ['name' => 'foo', 'number' => 2],
  ['name' => 'foo', 'number' => 3],
  ['name' => 'bar', 'number' => 4],
  ['name' => 'bar', 'number' => 5],
  ['name' => 'bar', 'number' => 6],
];

$treeData = array_reduce($flatData, function ($tree, $data) {
  $key = $data['name'];

  if (empty($tree[$key])) {
    $tree[$key] = $data;
    unset($tree[$key]['number']);
  }

  $tree[$key]['numbers'][] = $data['number'];

  return $tree;
}, []);

print_r($treeData);

https://repl.it/G4Cg

Answer 3

Может быть возможным решением:

<?php
$var = array(
    array("Name" => "Alfred", "Number" => 1),
    array("Name" => "Alfred", "Number" => 2),
    array("Name" => "Alfred", "Number" => 3),
    array("Name" => "Aethelstan", "Number" => 4),
    array("Name" => "Aethelstan", "Number" => 5),
    array("Name" => "Aethelstan", "Number" => 6),
);

$result = [];
foreach ($var as $key => $value) {
    if (!isset($result[$value['Name']])) {
        $result[$value['Name']] =[];
    }
    $result[$value['Name']][] = $value['Number'];
}

$final_result = [];
foreach ($result as $key => $value) {
    $final_result[] = ["name" => $key, "number" => $value];
}

print_r($final_result);