Historically, PHPLIB has used @internal to annotate components not recommended for use by consumers (i.e. open to BC breaks between non-major releases).

Many classes throughout the library also use @api. This seems redundant, as anything without an @internal annotation is implicitly available to consumers.

Consider removing all instances of @api throughout the library.

This issue came up in mongodb/mongo-php-library#1059 for PHPLIB-1022.