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.
SNMP_OID_OUTPUT_SUFFIX
    (integer)
   SNMP_OID_OUTPUT_MODULE
    (integer)
   SNMP_OID_OUTPUT_FULL
    (integer)
   SNMP_OID_OUTPUT_NUMERIC
    (integer)
   SNMP_OID_OUTPUT_UCD
    (integer)
   SNMP_OID_OUTPUT_NONE
    (integer)
   SNMP_VALUE_LIBRARY
    (integer)
   SNMP_VALUE_PLAIN
    (integer)
   SNMP_VALUE_OBJECT
    (integer)
   SNMP_BIT_STR
    (integer)
   SNMP_OCTET_STR
    (integer)
   SNMP_OPAQUE
    (integer)
   SNMP_NULL
    (integer)
   SNMP_OBJECT_ID
    (integer)
   SNMP_IPADDRESS
    (integer)
   SNMP_COUNTER
    (integer)
   SNMP_UNSIGNED
    (integer)
   SNMP_TIMETICKS
    (integer)
   SNMP_UINTEGER
    (integer)
   SNMP_INTEGER
    (integer)
   SNMP_COUNTER64
    (integer)