(PHP 5 >= 5.1.0 < 5.4.0)
sqlite_key -- SQLiteResult::key — Returns the current row index
面向对象风格 (method):
SQLiteResult::key() returns the current row index of
the buffered result set result.
Unlike all other SQLite functions, this function does not have a procedural version, and can only be called as a method on a SQLiteResult object.
Returns the current row index of the buffered result set
result.