一，常用函数

获取当前用户ID的方式：

$user_ID = get_current_user_id();

通过邮箱获取用户信息的方式：

$user = get_user_by( 'email', 'user@example.com' );

通过ID获取用户信息的方式：

$user = get_user_by( 'id', '123' );

二，WP_User 类

通过 WP_User 类获取用户信息

$user = new WP_User($id);

方法：

WP_User::get_data_by( string $field, string|int $value )
WP_User::exists()
WP_User::has_prop( string $key )
WP_User::to_array()
WP_User::get_role_caps()
WP_User::add_role( string $role ) WP_User::set_role( string $role ) WP_User::remove_role( string $role )
WP_User::add_cap( string $cap, bool $grant = true ) WP_User::remove_cap( string $cap ) WP_User::remove_all_caps()
WP_User::has_cap( string $cap )
WP_User::get_site_id()

用户信息：

WP_User Object
(
    [data] => stdClass Object
        (
            [ID] => 4
            [user_login] => rt_6402b8b489b62
            [user_pass] => $P$B71hn.v3FJgST5g3LgFeTIbwNz5dpC.
            [user_nicename] => 4
            [user_email] => s@foxmail.com
            [user_url] => 
            [user_registered] => 2023-03-04 03:19:16
            [user_activation_key] => 
            [user_status] => 0
            [display_name] => s******m
        )

    [ID] => 4
    [caps] => Array
        (
            [subscriber] => 1
        )

    [cap_key] => wp_capabilities
    [roles] => Array
        (
            [0] => subscriber
        )

    [allcaps] => Array
        (
            [read] => 1
            [level_0] => 1
            [subscriber] => 1
        )

    [filter] => 
    [site_id:WP_User:private] => 1
)

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