Runtime Configuration
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# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`MONGO_STREAMS` (integer)
  Alias of `MONGO_SUPPORTS_STREAMS`
`MONGO_SUPPORTS_STREAMS` (integer)
  1 when compiled against PHP Streams (default since 1.4.0).
`MONGO_SUPPORTS_SSL` (integer)
  1 when OpenSSL is enabled and available.
`MONGO_SUPPORTS_AUTH_MECHANISM_MONGODB_CR` (integer)
  1 when MongoDB-Challenge/Reponse authentication is compiled in.
`MONGO_SUPPORTS_AUTH_MECHANISM_MONGODB_X509` (integer)
  1 when x.509 authentication is compiled in.
`MONGO_SUPPORTS_AUTH_MECHANISM_GSSAPI` (integer)
  1 when GSSAPI authentication is compiled in.
`MONGO_SUPPORTS_AUTH_MECHANISM_PLAIN` (integer)
  1 when PLAIN authentication is compiled in.
`MONGO_STREAM_NOTIFY_TYPE_IO_INIT` (integer)
`MONGO_STREAM_NOTIFY_TYPE_LOG` (integer)
`MONGO_STREAM_NOTIFY_IO_READ` (integer)
`MONGO_STREAM_NOTIFY_IO_WRITE` (integer)
`MONGO_STREAM_NOTIFY_IO_PROGRESS` (integer)
`MONGO_STREAM_NOTIFY_IO_COMPLETED` (integer)
`MONGO_STREAM_NOTIFY_LOG_INSERT` (integer)
`MONGO_STREAM_NOTIFY_LOG_QUERY` (integer)
`MONGO_STREAM_NOTIFY_LOG_UPDATE` (integer)
`MONGO_STREAM_NOTIFY_LOG_DELETE` (integer)
`MONGO_STREAM_NOTIFY_LOG_GETMORE` (integer)
`MONGO_STREAM_NOTIFY_LOG_KILLCURSOR` (integer)
`MONGO_STREAM_NOTIFY_LOG_BATCHINSERT` (integer)
`MONGO_STREAM_NOTIFY_LOG_RESPONSE_HEADER` (integer)
`MONGO_STREAM_NOTIFY_LOG_WRITE_REPLY` (integer)
`MONGO_STREAM_NOTIFY_LOG_CMD_INSERT` (integer)
`MONGO_STREAM_NOTIFY_LOG_CMD_UPDATE` (integer)
`MONGO_STREAM_NOTIFY_LOG_CMD_DELETE` (integer)
`MONGO_STREAM_NOTIFY_LOG_WRITE_BATCH` (integer)

Runtime Configuration
Manual
Mongo
PHP Manual