Dump7ZipOutput.php

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<?php
use MediaWiki\Shell\Shell;

class Dump7ZipOutput extends DumpPipeOutput {
    protected $compressionLevel;

    public function __construct( $file, $cmpLevel = 4 ) {
        $this->compressionLevel = $cmpLevel;
        $command = $this->setup7zCommand( $file );
        parent::__construct( $command );
        $this->filename = $file;
    }

    function setup7zCommand( $file ) {
        $command = "7za a -bd -si -mx=";
        $command .= Shell::escape( $this->compressionLevel ) . ' ';
        $command .= Shell::escape( $file );
        // Suppress annoying useless crap from p7zip
        // Unfortunately this could suppress real error messages too
        $command .= ' >' . wfGetNull() . ' 2>&1';
        return $command;
    }

    function closeAndRename( $newname, $open = false ) {
        $newname = $this->checkRenameArgCount( $newname );
        if ( $newname ) {
            fclose( $this->handle );
            proc_close( $this->procOpenResource );
            $this->renameOrException( $newname );
            if ( $open ) {
                $command = $this->setup7zCommand( $this->filename );
                $this->startCommand( $command );
            }
        }
    }
}