# 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.

`VARNISH_STATUS_SYNTAX` (int)
`VARNISH_STATUS_UNKNOWN` (int)
`VARNISH_STATUS_UNIMPL` (int)
`VARNISH_STATUS_TOOFEW` (int)
`VARNISH_STATUS_TOOMANY` (int)
`VARNISH_STATUS_PARAM` (int)
`VARNISH_STATUS_AUTH` (int)
`VARNISH_STATUS_OK` (int)
`VARNISH_STATUS_CANT` (int)
`VARNISH_STATUS_COMMS` (int)
`VARNISH_STATUS_CLOSE` (int)
`VARNISH_CONFIG_IDENT` (string)
`VARNISH_CONFIG_HOST` (string)
`VARNISH_CONFIG_PORT` (string)
`VARNISH_CONFIG_TIMEOUT` (string)
`VARNISH_CONFIG_SECRET` (string)
`VARNISH_CONFIG_COMPAT` (string)
`VARNISH_COMPAT_2` (int)
`VARNISH_COMPAT_3` (int)