添加鍵值對現有陣列

Question

我有一個可變$users設置爲類似於通過這個陣列循環調用一個函數來計算年齡低於

Array(
    [4] => Array(
     [userid] => 4 
     [name] => Mike 
     [gender] => M 
    ) 

    [5] => Array(
     [userid] => 5 
     [name] => Sally 
     [gender] => F 
    ) 

    [6] => Array(
     [userid] => 6 
     [name] => Steve 
     [gender] => M 
    ) 
) 

我然後有代碼的陣列。

foreach($users as $user){ 
    $age = getUserAge($user->id); 
} 

我如何把變量$age，並將其添加到$users導致與後續的陣列？

Array(
    [4] => Array(
     [userid] => 4 
     [name] => Mike 
     [gender] => M 
     [age] => 35 
    ) 

    [5] => Array(
     [userid] => 5 
     [name] => Sally 
     [gender] => F 
     [age] => 24 
    ) 

    [6] => Array(
     [userid] => 6 
     [name] => Steve 
     [gender] => M 
     [age] => 32 
    ) 
) 

Answer 1

foreach($users as &$user){ 
    $age = getUserAge($user['userid']); 
    $user['age'] = $age; 
} 

緊湊型：

foreach($users as &$user){ 
    $user['age'] = getUserAge($user['userid']); 
} 

Answer 2

foreach($users as $index => $user) { 
    $users[$index]['age'] = getUserAge($user['userid']); 
}