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Callback function for usort used to sort the fulltext results.

int searchSort (string $a, string $b)

Expected type: String
Description: A word

Expected type: String
Description: Another word

Expected type: Enumerated Integer
Description: Indicates which item is more important (see PHP manual on usort for more info)

Possible integer values
Allowed values	Description
-1	If using fulltext index, this indicates that $a is more important than $b; otherwise it means $b is more important (importance based on length and whether or not each word is excluded from the search)
0	$a and $b are equally important (regardless of search method)
1	If you're using a fulltext index, this indicates that $b is more important than $a; otherwise it means $a is more important than $b

The order of sorting is: large words, small words, large words that are excluded from the search, small words that are excluded.
See http://www.php.net/usort for more information on usort
Finds the length of each word
Subtracts 1000 from the length if the word is excluded
Compares the results of the length calculation for both variables