ErrorPageError.php

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<?php
class ErrorPageError extends MWException implements ILocalizedException {
    const SEND_OUTPUT = 0;
    const STAGE_OUTPUT = 1;
    public $title, $msg, $params;
 
    public function __construct( $title, $msg, $params = [] ) {
        $this->title = $title;
        $this->msg = $msg;
        $this->params = $params;
 
        // T46111: Messages in the log files should be in English and not
        // customized by the local wiki. So get the default English version for
        // passing to the parent constructor. Our overridden report() below
        // makes sure that the page shown to the user is not forced to English.
        $enMsg = $this->getMessageObject();
        $enMsg->inLanguage( 'en' )->useDatabase( false );
        parent::__construct( $enMsg->text() );
    }
 
    public function getMessageObject() {
        if ( $this->msg instanceof Message ) {
            return clone $this->msg;
        }
        return wfMessage( $this->msg, $this->params );
    }
 
    public function report( $action = self::SEND_OUTPUT ) {
        if ( self::isCommandLine() || defined( 'MW_API' ) ) {
            parent::report();
        } else {
            global $wgOut;
            $wgOut->showErrorPage( $this->title, $this->msg, $this->params );
            // Allow skipping of the final output step, so that web-based page views
            // from MediaWiki.php, can inspect the staged OutputPage state, and perform
            // graceful shutdown via doPreOutputCommit first, just like for regular
            // output when there isn't an error page.
            if ( $action === self::SEND_OUTPUT ) {
                $wgOut->output();
            }
        }
    }
}