Create a user in WordPress from a php page/script outside of the WordPress system.

wordpress-create-user.php

<?php

// [wp insert user « WordPress Codex](http://codex.wordpress.org/Function_Reference/wp_insert_user)
require_once "wordpress/wp-load.php";

$user_info = array(
	"user_pass"     => "test123",
	"user_login"    => "username",
	"user_nicename" => "username",
	"user_email"    => "[email protected]",
	"display_name"  => "John Doe",
	"first_name"    => "John",
	"last_name"     => "Doe",
);

$insert_user_result = wp_insert_user( $user_info );

if ( is_wp_error($return) ) {
   die($insert_user_result->get_error_message());
} else {
	echo "Successfully created user with id: {$insert_user_result}";
}