(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_errno — Return error code for last fdf operation
Gets the error code set by the last FDF function call.
A textual description of the error may be obtained using with fdf_error().
此函数没有参数。
Returns the error code as an integer, or zero if there was no errors.