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SetFieldWeights
Prototype: function SetFieldWeights ( $weights )
Binds per-field weights by name. Parameter must be a hash (associative array) mapping string field names to integer weights.
Match ranking can be affected by per-field weights. For instance, see the section called “Search results ranking” for an explanation how phrase proximity ranking is affected. This call lets you specify what non-default weights to assign to different full-text fields.
The weights must be positive 32-bit integers. The final weight will be a 32-bit integer too. Default weight value is 1. Unknown field names will be silently ignored.
There is no enforced limit on the maximum weight value at the moment. However, beware that if you set it too high you can start hitting 32-bit wraparound issues. For instance, if you set a weight of 10,000,000 and search in extended mode, then maximum possible weight will be equal to 10 million (your weight) by 1 thousand (internal BM25 scaling factor, see the section called “Search results ranking”) by 1 or more (phrase proximity rank). The result is at least 10 billion that does not fit in 32 bits and will be wrapped around, producing unexpected results.
