php - Merge array-of-array with specifics similar values -

imagine have array:

$users = []; $users[0] = [ "name" => "john doe", "age" => 48,                "email" => "john.doe@server-a.com", "points" => 5 ]; $users[1] = [ "name" => "john brother", "age" => 32,                "email" => "john.brother@server-a.com", "points" => 8 ]; $users[2] = [ "name" => "john doe", "age" => 48,                "email" => "john.doe@server-b.com", "points" => 3 ]; $users[3] = [ "name" => "john doe", "age" => 49,                "email" => "john.doe@server-b.com", "points" => 7 ]; 

in code, need merge users when (same name + same age) or (same email), sum points , return unique copy of user, considering newer information of user, if merged.

so, note that:

• user#0 can merge user#2, because share (same name + same age);
• but user#0 can't merge directly user#3, because of don't have similarity;
• user#2 can merge user#3, because share (same email);
• so, indirectly, user#0 can merge user#3 , user#2;

the result expected is:

$users[] = [ "name" => "john brother", "age" => 32,               "email" => "john.brother@server-a.com", "points" => 8 ]; $users[] = [ "name" => "john doe", "age" => 49,               "email" => "john.doe@server-b.com", "points" => 15 ]; 

note: user#id, after merge, doesn't matter.

i'm not sure if there more efficient or elegant approach can try this:

$result = []; $tmp = []; array_walk($users, function ($value) use (&$result, &$tmp) {     $hash = md5($value['name'].$value['age']);     $sum  = $value['points'];     $e    = $value['email'];     if (array_key_exists($hash, $result)) {         $sum += $result[$hash]['points'];     } elseif (array_key_exists($e, $tmp)) {         $hash = md5($tmp[$e]['name'].$tmp[$e]['age']);         $sum += $result[$hash]['points'];     }     $result[$hash] = $tmp[$e] = $value;     $result[$hash]['points'] = $sum; });  $users = array_values($result); var_dump($users); 

the output is:

array (size=2)   0 =>      array (size=4)       'name' => string 'john doe' (length=8)       'age' => int 49       'email' => string 'john.doe@server-b.com' (length=21)       'points' => int 15   1 =>      array (size=4)       'name' => string 'john brother' (length=12)       'age' => int 32       'email' => string 'john.brother@server-a.com' (length=25)       'points' => int 8