(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_error — Return error description for FDF error code
fdf_error ([ int $error_code = -1 ] ) : string
Gets a textual description for the FDF error code given in error_code.
error_code
An error code obtained with fdf_errno(). If not provided, this function uses the internal error code set by the last operation.
Returns the error message as a string, or the string no error if nothing went wrong.
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https://www.php.net/manual/en/function.fdf-error.php