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.
SEARCHD_OK
     (integer)
    SEARCHD_ERROR
     (integer)
    SEARCHD_RETRY
     (integer)
    SEARCHD_WARNING
     (integer)
    SPH_MATCH_ALL
     (integer)
    SPH_MATCH_ANY
     (integer)
    SPH_MATCH_PHRASE
     (integer)
    SPH_MATCH_BOOLEAN
     (integer)
    SPH_MATCH_EXTENDED
     (integer)
    SPH_MATCH_FULLSCAN
     (integer)
    SPH_MATCH_EXTENDED2
     (integer)
    SPH_RANK_PROXIMITY_BM25
     (integer)
    SPH_RANK_BM25
     (integer)
    SPH_RANK_NONE
     (integer)
    SPH_RANK_WORDCOUNT
     (integer)
    SPH_SORT_RELEVANCE
     (integer)
    SPH_SORT_ATTR_DESC
     (integer)
    SPH_SORT_ATTR_ASC
     (integer)
    SPH_SORT_TIME_SEGMENTS
     (integer)
    SPH_SORT_EXTENDED
     (integer)
    SPH_SORT_EXPR
     (integer)
    SPH_FILTER_VALUES
     (integer)
    SPH_FILTER_RANGE
     (integer)
    SPH_FILTER_FLOATRANGE
     (integer)
    SPH_ATTR_INTEGER
     (integer)
    SPH_ATTR_TIMESTAMP
     (integer)
    SPH_ATTR_ORDINAL
     (integer)
    SPH_ATTR_BOOL
     (integer)
    SPH_ATTR_FLOAT
     (integer)
    SPH_ATTR_MULTI
     (integer)
    SPH_GROUPBY_DAY
     (integer)
    SPH_GROUPBY_WEEK
     (integer)
    SPH_GROUPBY_MONTH
     (integer)
    SPH_GROUPBY_YEAR
     (integer)
    SPH_GROUPBY_ATTR
     (integer)
    SPH_GROUPBY_ATTRPAIR
     (integer)