PHP合并具有相同键/值的数组

发布时间：2020-12-13 21:33:36 所属栏目：PHP教程来源：网络整理

导读：如果我希望将这个 PHP数组合并为一个数组中的最低ID(1649).所以我只会看到 array:1 [ 1649 = array:2 [ "firstName" = "jack" "lastName" = "straw" "mergedWith" array:3 [ "id" ='1650' "id" ='1651' "id" ='1652' ] ] ] 而不是…… array:4 [ 1649 = arra

如果我希望将这个 PHP数组合并为一个数组中的最低ID(1649).所以我只会看到

array:1 [
    1649 => array:2 [
      "firstName"   => "jack"
      "lastName"    => "straw"
      "mergedWith"  array:3 [
         "id" =>'1650'
         "id" =>'1651'
         "id" =>'1652'
      ]
    ]
  ]

而不是……

array:4 [
    1649 => array:2 [
      "firstName" => "jack"
      "lastName" => "straw"
    ]
    1650 => array:2 [
      "firstName" => "jack"
      "lastName" => "straw"
    ]
    1651 => array:2 [
      "firstName" => "jack"
      "lastName" => "straw"
    ]
    1652 => array:2 [
      "firstName" => "jack"
      "lastName" => "straw"
     ]
  ]

我有一个循环运行,可以拉出重复项并找到组中的最低ID,但不确定将它们合并为一个的正确方法.

我展示的代码是搜索结果,该搜索已在这些特定字段中标识了具有重复条目的ID.我只是想进一步细化它不删除,但在id 1649的末尾添加一个字段,表示mergedWith(1650,1651,1652)

解决方法

一种方法是按名字和姓氏分组,然后反转分组以获得单个ID.事先kursort输入,以确保您获得最低的ID.

krsort($input);

//group
foreach ($input as $id => $person) {
    // overwrite the id each time,but since the input is sorted by id in descending order,// the last one will be the lowest id
    $names[$person['lastName']][$person['firstName']] = $id;
}

// ungroup to get the result
foreach ($names as $lastName => $firstNames) {
    foreach ($firstNames as $firstName => $id) {
        $result[$id] = ['firstName' => $firstName,'lastName' => $lastName];
    }
}

编辑：根据您更新的问题,没有太多不同.只保留所有ID而不是单个ID.

krsort($input);

foreach ($input as $id => $person) {
    //                   append instead of overwrite ↓ 
    $names[$person['lastName']][$person['firstName']][] = $id;
}
foreach ($names as $lastName => $firstNames) {
    foreach ($firstNames as $firstName => $ids) {
        // $ids is already in descending order based on the initial krsort
        $id = array_pop($ids);  // removes the last (lowest) id and returns it
        $result[$id] = [
            'firstName' => $firstName,'lastName' => $lastName,'merged_with' => implode(',',$ids)
        ];
    }
}

（编辑：李大同）

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