BadTitleError.php

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<?php
class BadTitleError extends ErrorPageError {
    public function __construct( $msg = 'badtitletext', $params = [] ) {
        if ( $msg instanceof MalformedTitleException ) {
            $errorMessage = $msg->getErrorMessage();
            if ( !$errorMessage ) {
                parent::__construct( 'badtitle', 'badtitletext', [] );
            } else {
                $errorMessageParams = $msg->getErrorMessageParameters();
                parent::__construct( 'badtitle', $errorMessage, $errorMessageParams );
            }
        } else {
            parent::__construct( 'badtitle', $msg, $params );
        }
    }
 
    public function report( $action = self::SEND_OUTPUT ) {
        global $wgOut;
 
        $wgOut->setStatusCode( 404 );
 
        parent::report( self::STAGE_OUTPUT );
 
        // Unconditionally cache the error for an hour, see T316932
        $wgOut->enableClientCache();
        $wgOut->setCdnMaxage( 3600 );
 
        if ( $action === self::SEND_OUTPUT ) {
            $wgOut->output();
        }
    }
}