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。
CLSCTX_INPROC_SERVER
(integer)
CLSCTX_INPROC_HANDLER
(integer)
CLSCTX_LOCAL_SERVER
(integer)
CLSCTX_REMOTE_SERVER
(integer)
CLSCTX_SERVER
(integer)
CLSCTX_ALL
(integer)
VT_NULL
(integer)
VT_EMPTY
(integer)
VT_UI1
(integer)
VT_I2
(integer)
VT_I4
(integer)
VT_R4
(integer)
VT_R8
(integer)
VT_BOOL
(integer)
VT_ERROR
(integer)
VT_CY
(integer)
VT_DATE
(integer)
VT_BSTR
(integer)
VT_DECIMAL
(integer)
VT_UNKNOWN
(integer)
VT_DISPATCH
(integer)
VT_VARIANT
(integer)
VT_I1
(integer)
VT_UI2
(integer)
VT_UI4
(integer)
VT_INT
(integer)
VT_UINT
(integer)
VT_ARRAY
(integer)
VT_BYREF
(integer)
CP_ACP
(integer)
CP_MACCP
(integer)
CP_OEMCP
(integer)
CP_UTF7
(integer)
CP_UTF8
(integer)
CP_SYMBOL
(integer)
CP_THREAD_ACP
(integer)
VARCMP_LT (integer)VARCMP_EQ (integer)VARCMP_GT (integer)VARCMP_NULL (integer)NORM_IGNORECASE (integer)NORM_IGNORENONSPACE (integer)NORM_IGNORESYMBOLS (integer)NORM_IGNOREWIDTH (integer)NORM_IGNOREKANATYPE (integer)NORM_IGNOREKASHIDA (integer)DISP_E_DIVBYZERO (integer)DISP_E_OVERFLOW (integer)MK_E_UNAVAILABLE (integer)