ErrorPageError.php

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<?php
class ErrorPageError extends MWException {
    public $title, $msg, $params;
 
    public function __construct( $title, $msg, $params = [] ) {
        $this->title = $title;
        $this->msg = $msg;
        $this->params = $params;
 
        // Bug 44111: 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.
        if ( $msg instanceof Message ) {
            $enMsg = clone $msg;
        } else {
            $enMsg = wfMessage( $msg, $params );
        }
        $enMsg->inLanguage( 'en' )->useDatabase( false );
        parent::__construct( $enMsg->text() );
    }
 
    public function report() {
        if ( self::isCommandLine() || defined( 'MW_API' ) ) {
            parent::report();
        } else {
            global $wgOut;
            $wgOut->showErrorPage( $this->title, $this->msg, $this->params );
            $wgOut->output();
        }
    }
}