wiki.techinc.nl/maintenance/resetUserEmail.php

<?php
/**
 * Reset user email.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Maintenance
 */

require_once __DIR__ . '/Maintenance.php';

/**
 * Maintenance script that resets user email.
 *
 * @since 1.27
 * @ingroup Maintenance
 */
class ResetUserEmail extends Maintenance {
	public function __construct() {
		$this->addDescription( "Resets a user's email" );
		$this->addArg( 'user', 'Username or user ID, if starts with #', true );
		$this->addArg( 'email', 'Email to assign' );
		parent::__construct();
	}

	public function execute() {
		$userName = $this->getArg( 0 );
		if ( preg_match( '/^#\d+$/', $userName ) ) {
			$user = User::newFromId( substr( $userName, 1 ) );
		} else {
			$user = User::newFromName( $userName );
		}
		if ( !$user || !$user->getId() || !$user->loadFromId() ) {
			$this->error( "Error: user '$userName' does not exist\n", 1 );
		}

		$email = $this->getArg( 1 );
		if ( !Sanitizer::validateEmail( $email ) ) {
			$this->error( "Error: email '$email' is not valid\n", 1 );
		}

		// Code from https://wikitech.wikimedia.org/wiki/Password_reset
		$user->setEmail( $email );
		$user->setEmailAuthenticationTimestamp( wfTimestampNow() );
		$user->saveSettings();
		// Kick whomever is currently controlling the account off
		$user->setPassword( PasswordFactory::generateRandomPasswordString( 128 ) );
	}
}

$maintClass = 'ResetUserEmail';
require_once RUN_MAINTENANCE_IF_MAIN;