elFinder\elFinderVolumeLocalFileSystem::_checkArchivers PHP Method

    protected function _checkArchivers()
    {
        if (!function_exists('exec')) {
            $this->options['archivers'] = $this->options['archive'] = array();
            return;
        }
        $arcs = array('create' => array(), 'extract' => array());
        //exec('tar --version', $o, $ctar);
        $this->procExec('tar --version', $o, $ctar);
        if ($ctar == 0) {
            $arcs['create']['application/x-tar'] = array('cmd' => 'tar', 'argc' => '-cf', 'ext' => 'tar');
            $arcs['extract']['application/x-tar'] = array('cmd' => 'tar', 'argc' => '-xf', 'ext' => 'tar');
            //$test = exec('gzip --version', $o, $c);
            unset($o);
            $test = $this->procExec('gzip --version', $o, $c);
            if ($c == 0) {
                $arcs['create']['application/x-gzip'] = array('cmd' => 'tar', 'argc' => '-czf', 'ext' => 'tgz');
                $arcs['extract']['application/x-gzip'] = array('cmd' => 'tar', 'argc' => '-xzf', 'ext' => 'tgz');
            }
            unset($o);
            //$test = exec('bzip2 --version', $o, $c);
            $test = $this->procExec('bzip2 --version', $o, $c);
            if ($c == 0) {
                $arcs['create']['application/x-bzip2'] = array('cmd' => 'tar', 'argc' => '-cjf', 'ext' => 'tbz');
                $arcs['extract']['application/x-bzip2'] = array('cmd' => 'tar', 'argc' => '-xjf', 'ext' => 'tbz');
            }
        }
        unset($o);
        //exec('zip --version', $o, $c);
        $this->procExec('zip -v', $o, $c);
        if ($c == 0) {
            $arcs['create']['application/zip'] = array('cmd' => 'zip', 'argc' => '-r9', 'ext' => 'zip');
        }
        unset($o);
        $this->procExec('unzip --help', $o, $c);
        if ($c == 0) {
            $arcs['extract']['application/zip'] = array('cmd' => 'unzip', 'argc' => '', 'ext' => 'zip');
        }
        unset($o);
        //exec('rar --version', $o, $c);
        $this->procExec('rar --version', $o, $c);
        if ($c == 0 || $c == 7) {
            $arcs['create']['application/x-rar'] = array('cmd' => 'rar', 'argc' => 'a -inul', 'ext' => 'rar');
            $arcs['extract']['application/x-rar'] = array('cmd' => 'rar', 'argc' => 'x -y', 'ext' => 'rar');
        } else {
            unset($o);
            //$test = exec('unrar', $o, $c);
            $test = $this->procExec('unrar', $o, $c);
            if ($c == 0 || $c == 7) {
                $arcs['extract']['application/x-rar'] = array('cmd' => 'unrar', 'argc' => 'x -y', 'ext' => 'rar');
            }
        }
        unset($o);
        //exec('7za --help', $o, $c);
        $this->procExec('7za --help', $o, $c);
        if ($c == 0) {
            $arcs['create']['application/x-7z-compressed'] = array('cmd' => '7za', 'argc' => 'a', 'ext' => '7z');
            $arcs['extract']['application/x-7z-compressed'] = array('cmd' => '7za', 'argc' => 'e -y', 'ext' => '7z');
            if (empty($arcs['create']['application/x-gzip'])) {
                $arcs['create']['application/x-gzip'] = array('cmd' => '7za', 'argc' => 'a -tgzip', 'ext' => 'tar.gz');
            }
            if (empty($arcs['extract']['application/x-gzip'])) {
                $arcs['extract']['application/x-gzip'] = array('cmd' => '7za', 'argc' => 'e -tgzip -y', 'ext' => 'tar.gz');
            }
            if (empty($arcs['create']['application/x-bzip2'])) {
                $arcs['create']['application/x-bzip2'] = array('cmd' => '7za', 'argc' => 'a -tbzip2', 'ext' => 'tar.bz');
            }
            if (empty($arcs['extract']['application/x-bzip2'])) {
                $arcs['extract']['application/x-bzip2'] = array('cmd' => '7za', 'argc' => 'a -tbzip2 -y', 'ext' => 'tar.bz');
            }
            if (empty($arcs['create']['application/zip'])) {
                $arcs['create']['application/zip'] = array('cmd' => '7za', 'argc' => 'a -tzip -l', 'ext' => 'zip');
            }
            if (empty($arcs['extract']['application/zip'])) {
                $arcs['extract']['application/zip'] = array('cmd' => '7za', 'argc' => 'e -tzip -y', 'ext' => 'zip');
            }
            if (empty($arcs['create']['application/x-tar'])) {
                $arcs['create']['application/x-tar'] = array('cmd' => '7za', 'argc' => 'a -ttar -l', 'ext' => 'tar');
            }
            if (empty($arcs['extract']['application/x-tar'])) {
                $arcs['extract']['application/x-tar'] = array('cmd' => '7za', 'argc' => 'e -ttar -y', 'ext' => 'tar');
            }
        }
        $this->archivers = $arcs;
    }