我如何获得第一个数组元素，即数组本身？

Question

我有一个数据数组：

Array
(
[0] => Array
    (
        [chat_categories] => one cat
        [display_name] => admin user
        [user_email] => testemail1@email.com
        [user_login] => user
    )

[1] => Array
    (
        [chat_categories] => one cat
        [display_name] => Test User
        [user_email] => testemail@testsite.com
        [user_login] => testuser
    )

)

现在，我要从该数组中获取第一个元素，检查值display_name，user_email和user_login是否匹配，如果匹配成功，请更新wordpress用户表中的chat_categories列。

Answer 1

所以，对我而言，这对我有帮助

Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

Answer 2

您也可以将foreach loop用作：

$arr = array(
            "0" => array(
                   "chat_categories" => "one cat",
                   "display_name" => "admin user",
                   "user_email" => "testemail1@email.com",
                   "user_login" => "user"
             ),
           "1" => array(
                  "chat_categories" => "one cat",
                  "display_name" => "Test User",
                  "user_email" => "testemail@testsite.com",
                  "user_login" => "testuser"
            )
   );

foreach($arr as $innerArr){    
    $chat_categories = $innerArr["chat_categories"];
    $display_name = $innerArr["display_name"];
    $user_email = $innerArr["user_email"];
    $user_login = $innerArr["user_login"];
    $success = $wpdb->query("UPDATE $userTableName SET chat_categories = '".$chat_categories."' WHERE user_email = '".$user_email."' AND user_login ='".$user_login."'");
    }