Returns the data from the specified location in the database.
注意: 当安全模式被激活时,PHP 将检查被操作的文件或者目录是否与正在执行的脚本有相同的 UID(所有者)。
row_number
The row number. Must be between zero and the total number of rows minus one (0..filepro_rowcount() - 1)
field_number
The field number. Accepts values between zero and the total number of fields minus one (0..filepro_fieldcount() - 1)