從多個到多個PHP獲取

Question

我有這個PHP函數的問題，我試圖用他的角色和組獲取用戶，它的角色工作良好，但我有組的問題，因爲我得到相同的數組組，當然我想要的是重複的自由數組。我明白爲什麼我得到這個，因爲我的用戶有2個角色，我讓他在SQL查詢2次，誰能解釋我什麼是最佳實踐，以及如何避免這種情況，我應該使用這樣的查詢，或者我可以使用另一種查詢在哪裏我會找到所有組的成員，然後把它放在該數組中，但這是2個DB調用一個函數，它可能不是那麼好的解決方案。

function getAll($mysqli) { 
    $stmt = $mysqli->prepare("SELECT u.id, u.firstName, u.lastName, u.email, 
     u.phoneNumber, u.address, u.birthDate, ur.roleName, cg.id, cg.name FROM users as u 
     LEFT OUTER JOIN user_role as ur ON u.id = ur.userId 
     LEFT OUTER JOIN user_group as ug on ug.userId = u.id 
     LEFT OUTER JOIN control_group as cg on cg.id = ug.groupId"); 

    $stmt->execute(); 
    $stmt->bind_result($id, $firstName, $lastName, $email, $phoneNumber, 
     $address, $birthDate, $roleName, $groupId, $groupName); 
    $users = array(); 

    while ($stmt->fetch()) { 
     if (empty($users[$id])) { 
      $users[$id] = array(
       'id' => $id, 
       'firstName' => $firstName, 
       'lastName' => $lastName, 
       'email' => $email, 
       'phoneNumber' => $phoneNumber, 
       'address' => $address, 
       'birthDate' => $birthDate, 
       'roles' => array(), 
       'groups' => array() 
      ); 
     } 
     if ($roleName) { 
      $users[$id]['roles'][] = array(
       'roleName' => $roleName 
      ); 
     } 
     if ($groupId) { 
      $users[$id]['groups'][] = array(
       'groupName' => $groupName 
      ); 
     } 
    } 

    $stmt->close(); 
    $mysqli->close();; 
    echo json_encode($users); 
} 

當我執行該功能我得到這樣

{ 
    "1":{ 
     "id":1, 
     "firstName":"John", 
     "lastName":"Doe", 
     "email":"john@email.com", 
     "phoneNumber":"062-441234-123123", 
     "address":"Some Address 40\/2", 
     "birthDate":"1989-12-29", 
     "roles":[ 
     { 
      "roleName":"Admin" 
     }, 
     { 
      "roleName":"User" 
     } 
     ], 
     "groups":[ 
     { 
      "groupName":"Group 1" 
     }, 
     { 
      "groupName":"Group 1" 
     } 
     ] 
    }, 
    "2":{ 
     "id":2, 
     "firstName":"Jane", 
     "lastName":"Doe", 
     "email":"jane@email.com", 
     "phoneNumber":"0112-11121-221322", 
     "address":"Address 21ca", 
     "birthDate":"1975-12-28", 
     "roles":[ 
     { 
      "roleName":"Admin" 
     }, 
     { 
      "roleName":"User" 
     } 
     ], 
     "groups":[ 

     ] 
    } 
} 

Answer 1

響應您可以檢查是否一個角色（或一組）在數組中插入之前已經存在：

if ($roleName) { 
    $found = false; 
    foreach ($users[$id]['roles'] as $role) { 
     if($role['roleName'] == $roleName){ 
      $found = true; 
      break; 
     } 
    } 
    if($found == false) 
     $users[$id]['roles'][] = array(
      'roleName' => $roleName 
     ); 
} 

注意我給你一個基於你的結構的答案。但我強烈建議改變陣列的結構，以檢查角色的存在是否快速O(1)

編輯：爲了完成我的答案：我會說JSON結構不反映什麼真實的情況是。您聲明用戶具有角色和組，但這是真實的，但角色屬於該組。用戶可以在第1組的管理員和任何在第2組這就是爲什麼我認爲你應該輸出什麼是這樣的：

{ 
    "1":{ 
     "id":1, 
     "firstName":"John", 
     "lastName":"Doe", 
     "email":"john@email.com", 
     "phoneNumber":"062-441234-123123", 
     "address":"Some Address 40\/2", 
     "birthDate":"1989-12-29", 
     "groups":[ 
     { 
      "groupName": "Group 1", 
      "roles": [ 
       { 
        "roleName":"Admin" 
       }, 
       { 
        "roleName":"User" 
       } 
      ] 
     } 

     ] 
    }, 
    "2":{ 
     "id":2, 
     "firstName":"Jane", 
     "lastName":"Doe", 
     "email":"jane@email.com", 
     "phoneNumber":"0112-11121-221322", 
     "address":"Address 21ca", 
     "birthDate":"1975-12-28", 
     "groups":[ 

     ] 
    } 
}