As of version 1.8.0, the driver requires PHP 7.0 or higher. Previous versions of the driver allow compatibility with older PHP versions.
The driver requires » libbson and » libmongoc, and will use bundled versions of both libraries by default. System libraries may also be used, as discussed in the manual installation documentation.
   The driver, via libmongoc, optionally depends on a TLS library (e.g. OpenSSL)
   and will use it if available. If the build process fails to find a TLS
   library, users should check that the appropriate development package (e.g.
   libssl-dev) and
   » pkg-config are both
   installed. The process for detecting and configuring TLS libraries is
   discussed in more detail in the
   manual installation
   documentation.
  
» Cyrus SASL is an optional dependency to support Kerberos authentication and will be used if available.
Note: Due to potential problems representing 64-bit integers on 32-bit platforms, users are advised to use 64-bit environments. When using a 32-bit platform, be aware that any 64-bit integer read from the database will be returned as a MongoDB\BSON\Int64 instance instead of a PHP integer type.