PHP operation array problem

<?php
//////
$redata = array(
    0=>["id"=>1,"name"=>"","age"=>22,"hobby"=>""],
    1=>["id"=>1,"name"=>"","age"=>22,"hobby"=>""],
    2=>["id"=>2,"name"=>"","age"=>20,"hobby"=>""],
);

//   
$arr = array(
    0=>[
        "id"=>1,"name"=>"","age"=>22,"hobby"=> ["", ""]
    ],
    1=>[
        "id"=>2,"name"=>"","age"=>20,"hobby"=> [""]
    ]
);
Php
Apr.28,2021 
$redata = array(
  0 => ['id' => 1, 'name' => '', 'age' => 22, 'hobby' => ''],
  1 => ['id' => 1, 'name' => '', 'age' => 22, 'hobby' => ''],
  2 => ['id' => 2, 'name' => '', 'age' => 20, 'hobby' => ''],
);

$result = array_reduce($redata, function ($arr, $item) {
  $key = array_search($item['id'], array_column($arr, 'id'));
  if ($key === false) {
    $item['hobby'] = [$item['hobby']];
    $arr[] = $item;
  } else {
    $arr[$key]['hobby'][] = $item['hobby'];
  }
  return $arr;
}, []);

var_dump($result);
$arr = [];
foreach($redata as $k=>$row){
    foreach($row as $key => $item){
        if($key === 'hobby'){
            $arr[$row['id']][$key][] = $item; 
        }else{
            $arr[$row['id']][$key] = $item; 
        }
        
        
    }
}

var_dump($arr);
$arr = [];
foreach($redata as $v){
    $arr[$v['id']]['id'] = $v['id'];
    $arr[$v['id']]['name'] = $v['name'];
    $arr[$v['id']]['age'] = $v['age'];
    $arr[$v['id']]['hobby'][] = $v['hobby'];
}
$idMap = array_column($arr,'id');
array_multisort($arr,SORT_ASC,$idMap);
var_dump($arr);

if the array field is fixed, omit if judgment time

clipboard.png

clipboard.png
Code
`
$redata = array (

) 
0=>['id'=>1,'name'=>'','age'=>22,'hobby'=>''],
1=>['id'=>1,'name'=>'','age'=>22,'hobby'=>''],
2=>['id'=>2,'name'=>'','age'=>20,'hobby'=>''],

);

function hebing ($redata) {

foreach ($redata as $k => $v) {
    if($redata[$k]['id']==$redata[$k+1]['id']){
        $redata[$k+1]['hobby'] = [$redata[$k]['hobby'],$redata[$k+1]['hobby']];
        array_splice($redata, $k, 1);
    }
}
return $redata;

}
var_dump (hebing ($redata));
`

A foreach is easy to understand. 

function hobby_merge($redata)
{
    $result = [];
    foreach($redata as $item) {
        if (!isset($result[$item['id']])) {
            $item['hobby'] = (array) $item['hobby'];
            $result[$item['id']] = $item;
            continue;
        }
        $result[$item['id']]['hobby'][] = $item['hobby'];
    }
    return array_values($result);
}

Previous: How do shopping stations and video stations guess your favorite functions?

Next: After the mainWindow.minimize () method is called in electron, the page state is frozen, how to resume running?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1eb2c25-481d7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eb2c25-481d7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?