MediaWiki/maintenance/pageExists.php

<?php
/**
 * 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';

/**
 * @ingroup Maintenance
 */
class PageExists extends Maintenance {
	public function __construct() {
		parent::__construct();
		$this->addDescription( 'Report whether a specific page exists' );
		$this->addArg( 'title', 'Page title to check whether it exists' );
	}

	public function execute() {
		$titleArg = $this->getArg();
		$title = Title::newFromText( $titleArg );
		$pageExists = $title && $title->exists();

		$text = '';
		$code = 0;
		if ( $pageExists ) {
			$text = "{$title} exists.";
		} else {
			$text = "{$titleArg} doesn't exist.";
			$code = 1;
		}
		$this->output( $text );
		$this->error( '', $code );
	}
}

$maintClass = "PageExists";
require_once RUN_MAINTENANCE_IF_MAIN;