# 预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

`DBA_LMDB_USE_SUB_DIR` (int)
  LMDB Driver flag to allow the creation of a subdirectory for the database files. Available as of PHP 8.2.0.
`DBA_LMDB_NO_SUB_DIR` (int)
  LMDB Driver flag to disallow the creation of a subdirectory for the database files. Available as of PHP 8.2.0.

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