The Codex is always a good place to look for things. Check out this https://codex.wordpress.org/wp_get_current_user
Where you will find this sample code:
<?php
$current_user = wp_get_current_user();
/**
* @example Safe usage:
* $current_user = wp_get_current_user();
* if ( ! $current_user->exists() ) {
* return;
* }
*/
echo 'Username: ' . $current_user->user_login . '<br />';
echo 'User email: ' . $current_user->user_email . '<br />';
echo 'User first name: ' . $current_user->user_firstname . '<br />';
echo 'User last name: ' . $current_user->user_lastname . '<br />';
echo 'User display name: ' . $current_user->display_name . '<br />';
echo 'User ID: ' . $current_user->ID . '<br />';
Which uses the WP_User object: see https://codex.wordpress.org/Class_Reference/WP_User .
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