get_currentuserinfo(): bool|WP_User

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   Codex 10 years ago

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   Default Usage
   The call to get_currentuserinfo() places the current user’s info into $userdata, where it can be retrieved using member variables.

   <?php
   global $current_user;
   get_currentuserinfo();
   printf( __( 'Username: %s', 'textdomain' ), esc_html( $current_user->user_login ) ) . '<br />';
   printf( __( 'User email: %s', 'textdomain' ), esc_html( $current_user->user_email ) ) . '<br />';
   printf( __( 'User first name: %s', 'textdomain' ), esc_html( $current_user->user_firstname ) ) . '<br />';
   printf( __( 'User last name: %s', 'textdomain' ), esc_html( $current_user->user_lastname ) ) . '<br />';
   printf( __( 'User display name: %s', 'textdomain' ), esc_html( $current_user->display_name ) ) . '<br />';
   printf( __( 'User ID: %s', 'textdomain' ), esc_html( $current_user->ID ) );

   Result:

   Username: Zedd
   User email: my@email.com
   User level: 10
   User first name: John
   User last name: Doe
   User display name: John Doe
   User ID: 1