Zend_File_Transfer and its adapters support different options.
You can set all options either by passing them to the constructor or by calling
setOptions($options). getOptions()
will return the options that are currently set. The following is a list of all supported
options.
ignoreNoFile: If this option is set to
TRUE, all validators will ignore files that have not been uploaded by the form. The default value isFALSEwhich results in an error if no files were specified.