pageExists.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class PageExists extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->mDescription = "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;