Mass User Creation in WordPress

Case : you want to add mass user in your wordpress
Script :

require( '/wp-load.php' );
wp_create_user('otto', 'password', 'otto@ottodestruct.com');
wp_create_user('fake', 'fakepass', 'fake@example.com');
...

Source : http://wordpress.org/support/topic/mass-user-creation-in-wordpress-30