Exakat\Tasks\Doctor::checkOptional PHP Method

    private function checkOptional()
    {
        $stats = array();
        // check PHP 5.2
        $stats['PHP 5.2'] = $this->checkPHP($this->config->php52, '5.2');
        // check PHP 5.3
        $stats['PHP 5.3'] = $this->checkPHP($this->config->php53, '5.3');
        // check PHP 5.4
        $stats['PHP 5.4'] = $this->checkPHP($this->config->php54, '5.4');
        // check PHP 5.5
        $stats['PHP 5.5'] = $this->checkPHP($this->config->php55, '5.5');
        // check PHP 5.6
        $stats['PHP 5.6'] = $this->checkPHP($this->config->php56, '5.6');
        // check PHP 7.0
        $stats['PHP 7.0'] = $this->checkPHP($this->config->php70, '7.0');
        // check PHP 7.1
        $stats['PHP 7.1'] = $this->checkPHP($this->config->php71, '7.1');
        // check PHP 7.2
        $stats['PHP 7.2'] = $this->checkPHP($this->config->php72, '7.2');
        // git
        $res = trim(shell_exec('git --version 2>&1'));
        if (preg_match('/git version ([0-9\\.]+)/', $res, $r)) {
            //
            $stats['git']['installed'] = 'Yes';
            $stats['git']['version'] = $r[1];
        } else {
            $stats['git']['installed'] = 'No';
            $stats['git']['optional'] = 'Yes';
        }
        // hg
        $res = trim(shell_exec('hg --version 2>&1'));
        if (preg_match('/Mercurial Distributed SCM \\(version ([0-9\\.]+)\\)/', $res, $r)) {
            //
            $stats['hg']['installed'] = 'Yes';
            $stats['hg']['version'] = $r[1];
        } else {
            $stats['hg']['installed'] = 'No';
            $stats['hg']['optional'] = 'Yes';
        }
        // svn
        $res = trim(shell_exec('svn --version 2>&1'));
        if (preg_match('/svn, version ([0-9\\.]+) /', $res, $r)) {
            //
            $stats['svn']['installed'] = 'Yes';
            $stats['svn']['version'] = $r[1];
        } else {
            $stats['svn']['installed'] = 'No';
            $stats['svn']['optional'] = 'Yes';
        }
        // bazaar
        $res = trim(shell_exec('bzr --version 2>&1'));
        if (preg_match('/Bazaar \\(bzr\\) ([0-9\\.]+) /', $res, $r)) {
            //
            $stats['bzr']['installed'] = 'Yes';
            $stats['bzr']['version'] = $r[1];
        } else {
            $stats['bzr']['installed'] = 'No';
            $stats['bzr']['optional'] = 'Yes';
        }
        // composer
        $res = trim(shell_exec('composer -V 2>&1'));
        // remove colors from shell syntax
        $res = preg_replace('/\\e\\[[\\d;]*m/', '', $res);
        if (preg_match('/Composer version ([0-9\\.a-z@_\\(\\)\\-]+) /', $res, $r)) {
            //
            $stats['composer']['installed'] = 'Yes';
            $stats['composer']['version'] = $r[1];
        } else {
            $stats['composer']['installed'] = 'No';
        }
        // wget
        $res = explode("\n", shell_exec('wget -V 2>&1'));
        $res = $res[0];
        if ($res !== '') {
            //
            $stats['wget']['installed'] = 'Yes';
            $stats['wget']['version'] = $res;
        } else {
            $stats['wget']['installed'] = 'No';
        }
        // zip
        $res = shell_exec('zip -v  2>&1');
        if (preg_match('/not found/is', $res)) {
            $stats['zip']['installed'] = 'No';
        } elseif (preg_match('/Zip\\s+([0-9\\.]+)/is', $res, $r)) {
            $stats['zip']['installed'] = 'Yes';
            $stats['zip']['version'] = $r[1];
        } else {
            $stats['zip']['error'] = $res;
        }
        return $stats;
    }