| RequirementsAs of version 1.16.0, the extension requires PHP 7.2 or higher. Previous versions of the extension allow compatibility with older PHP versions. The extension 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 extension, 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.  » Cyrus SASL is an optional dependency to support Kerberos authentication and will be used if available. 
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