src/Composer/Downloader/ZipDownloader.php
protected function getErrorMessage($retval, $file)
    {
        switch ($retval) {
            case ZipArchive::ER_EXISTS:
                return sprintf("File '%s' already exists.", $file);
            case ZipArchive::ER_INCONS:
                return sprintf("Zip archive '%s' is inconsistent.", $file);
            case ZipArchive::ER_INVAL:
                return sprintf("Invalid argument (%s)", $file);
            case ZipArchive::ER_MEMORY:
                return sprintf("Malloc failure (%s)", $file);
            case ZipArchive::ER_NOENT:
                return sprintf("No such zip file: '%s'", $file);
            case ZipArchive::ER_NOZIP:
                return sprintf("'%s' is not a zip archive.", $file);
            case ZipArchive::ER_OPEN:
                return sprintf("Can't open zip file: %s", $file);
            case ZipArchive::ER_READ:
                return sprintf("Zip read error (%s)", $file);
            case ZipArchive::ER_SEEK:
                return sprintf("Zip seek error (%s)", $file);
            default:
                return sprintf("'%s' is not a valid zip archive, got error code: %s", $file, $retval);
        }
    }
protected function getErrorMessage($retval, $file)
    {
        switch ($retval) {
            case ZipArchive::ER_EXISTS:
                return sprintf("File '%s' already exists.", $file);
            case ZipArchive::ER_INCONS:
                return sprintf("Zip archive '%s' is inconsistent.", $file);
            case ZipArchive::ER_INVAL:
                return sprintf("Invalid argument (%s)", $file);
            case ZipArchive::ER_MEMORY:
                return sprintf("Malloc failure (%s)", $file);
            case ZipArchive::ER_NOENT:
                return sprintf("No such zip file: '%s'", $file);
            case ZipArchive::ER_NOZIP:
                return sprintf("'%s' is not a zip archive.", $file);
            case ZipArchive::ER_OPEN:
                return sprintf("Can't open zip file: %s", $file);
            case ZipArchive::ER_READ:
                return sprintf("Zip read error (%s)", $file);
            case ZipArchive::ER_SEEK:
                return sprintf("Zip seek error (%s)", $file);
            default:
                return sprintf("'%s' is not a valid zip archive, got error code: %s", $file, $retval);
        }
    }
protected function getErrorMessage ( $ retval , $ file ) { switch ( $ retval ) { case ZipArchive :: ER_EXISTS : return sprintf ( "File '%s' already exists." , $ file ) ; case ZipArchive :: ER_INCONS : return sprintf ( "Zip archive '%s' is inconsistent." , $ file ) ; case ZipArchive :: ER_INVAL : return sprintf ( "Invalid argument (%s)" , $ file ) ; case ZipArchive :: ER_MEMORY : return sprintf ( "Malloc failure (%s)" , $ file ) ; case ZipArchive :: ER_NOENT : return sprintf ( "No such zip file: '%s'" , $ file ) ; case ZipArchive :: ER_NOZIP : return sprintf ( "'%s' is not a zip archive." , $ file ) ; case ZipArchive :: ER_OPEN : return sprintf ( "Can't open zip file: %s" , $ file ) ; case ZipArchive :: ER_READ : return sprintf ( "Zip read error (%s)" , $ file ) ; case ZipArchive :: ER_SEEK : return sprintf ( "Zip seek error (%s)" , $ file ) ; default : return sprintf ( "'%s' is not a valid zip archive, got error code: %s" , $ file , $ retval ) ; } }
Give a meaningful error message to the user.

@param  int    $retval
@param  string $file
@return string
Give a meaningful error message to the user .