VersionPress\Utils\SystemInfo::getPermissionInfo PHP Method

    private static function getPermissionInfo()
    {
        $proc = proc_open('whoami', [['pipe', 'r'], ['pipe', 'w'], ['pipe', 'w']], $pipes);
        $procOpenUser = trim(stream_get_contents($pipes[1]));
        $processInfo = ['exec-user' => exec('whoami'), 'proc_open-user' => $procOpenUser];
        $writeTargets = ['ABSPATH' => ABSPATH, 'WP_CONTENT_DIR' => WP_CONTENT_DIR, 'sys_temp_dir' => sys_get_temp_dir()];
        foreach ($writeTargets as $target => $directory) {
            $filePath = $directory . '/' . '.vp-try-write-php';
            /** @noinspection PhpUsageOfSilenceOperatorInspection */
            @file_put_contents($filePath, "");
            $processInfo['php-can-write'][$target] = is_file($filePath);
            FileSystem::remove($filePath);
            $processInfo['php-can-delete'][$target] = !is_file($filePath);
            $filePath = $directory . '/' . '.vp-try-write-process';
            $process = new Process(sprintf("echo test > %s", ProcessUtils::escapeshellarg($filePath)));
            $process->run();
            $processInfo['process-can-write'][$target] = is_file($filePath);
            try {
                FileSystem::remove($filePath);
                $processInfo['php-can-delete-file-created-by-process'][$target] = !is_file($filePath);
            } catch (IOException $ex) {
                $processInfo['php-can-delete-file-created-by-process'][$target] = false;
            }
        }
        return $processInfo;
    }