Translations:Installation - LimeSurvey CE/9/en

The minimum set of requirements:
 * Minimum 250 MB disk space.
 * MySQL 5.5.3 or later OR Microsoft SQL Server 2005 or later OR Postgres 9 or later.
 * Minimum PHP 5.5.9 or later; however, we recommend PHP 7.0.0+ with the following modules/libraries enabled:
 * mbstring (Multibyte String Functions) extension library.
 * PDO database driver for MySQL (pdo_mysql or pdo_mysqli) or Postgres (pdo_pgsql) or MSSQL (pdo_sqlsrv for Windows and pdo_dblib for Linux).
 * Also, we assume in general that all PHP default libraries are enabled
 * hash
 * session
 * openssl or mcrypt
 * fileinfo
 * etc …