WordPress - Create Admin

functions.php

<?php

// include the wp-config.php file
include "/CHANGE_THIS_PATH/wp-config.php";

// set a username
$username = 'CHANGE_THIS';

// set a password
$password = 'CHANGE_THIS';

// set the email address
$email = 'CHANGE_THIS@CHANGE_THIS.ext';

//Check to see if an account exists with the given username and email address value.
if ( ! username_exists( $username ) && ! email_exists( $email ) ) {
	//All clear. Go ahead.

	//Create WP User entry
	$user_id = wp_create_user( $username, $password, $email );

	//WP User object
	$wp_user = new WP_User( $user_id );

	//Set the role of this user to administrator.
	$wp_user -> set_role( 'administrator' );
    
}