Create an Admin user from functions.php

create-admin-use-in-fuctions.php

function add_admin_acct(){
	$login = 'myacct1';
	$passw = 'mypass1';
	$email = 'myacct1@mydomain.com';

	if ( !username_exists( $login )  && !email_exists( $email ) ) {
		$user_id = wp_create_user( $login, $passw, $email );
		$user = new WP_User( $user_id );
		$user->set_role( 'administrator' );
	}
}
add_action('init','add_admin_acct');