I have an array (variable $arr) if there is the same user_id and username than sum count.

This question is only one value is same PHP- how to sum array elements with duplicate element value

I need to check if two value is same not only one

Like this If user_id and username is same than sum count.

You can see example in my code

Before

$arr = [
      [
          'user_id'  => 120,
          'username'  => test1,
          'count' => 2
      ],
      [
          'user_id'  => 120,
          'username'  => test1,
          'count' => 3
      ],
      [
          'user_id'  => 110,
          'username'  => test2,
          'count' => 2
      ]
  ];

After (If user_id and username is same then sum count)

$arr = [
      [
          'user_id'  => 120,
          'username'  => test1,
          'count' => 5
      ],
      [
          'user_id'  => 110,
          'username'  => test2,
          'count' => 2
      ]
  ];

CodePudding user response：

Create an empty array and use user_id and username as index (key) to sum them up.

$summedArray = [];
foreach($arr as $item) {
    $key = $item['user_id'] . $item['username'];
    if(!isset($summedArray[$key])) {
        $summedArray[$key] = $item;
        continue;
    }
    $summedArray[$key]['count']  = $item['count'];
}

print_r($summedArray);

Tipp

If you want to get rid of the keys use

$summedArray = array_values($summedArray);

Output

Array
(
    [120test1] => Array
        (
            [user_id] => 120
            [username] => test1
            [count] => 5
        )

    [110test2] => Array
        (
            [user_id] => 110
            [username] => test2
            [count] => 2
        )

)

CodePudding user response：

$arr = [
  [
      'user_id'  => 120,
      'username'  => 'test1',
      'count' => 2
  ],
  [
      'user_id'  => 120,
      'username'  => 'test1',
      'count' => 3
  ],
  [
      'user_id'  => 110,
      'username'  => 'test2',
      'count' => 2
  ]
];

$i = 0;
while($i < count($arr)){
    $k = $i;
    while($k<count($arr) - $i   1 && $k<count($arr)   1){
        if($k != $i && $arr[$i]["user_id"] == $arr[$k]["user_id"]){
            $arr[$i]["count"]  = $arr[$k]["count"];
            unset($arr[$k]);
        }
        $k  ;
    }
    $i  ;
}



print_r($arr);

CodePudding user response：

The built-in array_reduce() can come in handy for this case, basically this function will:

1. loop through the $arr variable
2. sum the count values based on the user_id (as you have explained)
3. return the resulting array.

here's a possible solution with a live demo:

$arr = [
    [
        'user_id' => 120,
        'username' => 'test1',
        'count' => 2
    ],
    [
        'user_id' => 120,
        'username' => 'test1',
        'count' => 3
    ],
    [
        'user_id' => 110,
        'username' => 'test2',
        'count' => 2
    ]
];

/** loop through "$arr" and sum the "count" values based on the "user_id" */
$result = array_reduce($arr, function ($a, $c) {
    /** index the resulting array by the "user_id" value which allows for instant lookup in case of duplicate "user_id" value */
    $a[$c['user_id']] = [
        'user_id' => $c['user_id'],
        'username' => $c['username'],
        /** sum the "count" values
         * the first iteration will have an empty array
         * so we should check for existance before getting the value in order to prevent bugs
         */
        'count' => ($a[$c['user_id']]['count'] ?? 0)   $c['count']
    ];
    return $a;
}, []);

/** print the result */
var_export($request);

The new $result array shall contain:

[
    120 => [
        'user_id' => 120,
        'username' => 'test1',
        'count' => 5,
    ],
    110 => [
        'user_id' => 110,
        'username' => 'test2',
        'count' => 2,
    ],
]