Change default WordPress new user notifications

gistfile1.phtml

<?php
/**
 * Prevent new user email notifications
 * This prevents new user email notifications being sent to users and administrators by commenting out the wp_mail functions. You could rewrite it to change the default registration email.
 * This should be put in a plugin or your themes functions file.
 * @link http://wordpress.org/extend/plugins/disable-wp-new-user-notification/
 * @author Jono Warren <jonathan_warren@bcl.co.uk>
 */
if ( !function_exists('wp_new_user_notification') ) {
	function wp_new_user_notification($user_id, $plaintext_pass = '') {

		$user = new WP_User($user_id);

		$user_login = stripslashes($user->user_login);
		$user_email = stripslashes($user->user_email);

		// The blogname option is escaped with esc_html on the way into the database in sanitize_option
		// we want to reverse this for the plain text arena of emails.
		$blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);

		$message  = sprintf(__('New user registration on your blog %s:'), $blogname) . "\r\n\r\n";
		$message .= sprintf(__('Username: %s'), $user_login) . "\r\n\r\n";
		$message .= sprintf(__('E-mail: %s'), $user_email) . "\r\n";

		// email to blog admin commented out by corey salzano
		// wp_mail(get_option('admin_email'), sprintf(__('[%s] New User Registration'), $blogname), $message);

		if ( empty($plaintext_pass) )
			return;

		$message  = sprintf(__('Username: %s'), $user_login) . "\r\n";
		$message .= sprintf(__('Password: %s'), $plaintext_pass) . "\r\n";
		$message .= wp_login_url() . "\r\n";

		// We don't want this emailed either
		// wp_mail($user_email, sprintf(__('[%s] Your username and password'), $blogname), $message);
	}
}