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Returns a result index if query could be executed, false on
failure or if connection is not a valid connection index. Details
about the error can be retrieved using the
pg_ErrorMessage() function if connection is
valid. Sends an SQL statement to the PostgreSQL database
specified by the connection index. The connection must be a valid
index that was returned by pg_Connect(). The
return value of this function is an index to be used to access
the results from other PostgreSQL functions.
Note:
PHP/FI returned 1 if the query was not expected to return data
(inserts or updates, for example) and greater than 1 even on
selects that did not return anything. No such assumption can be
made in PHP.
