The value that couldn't have possibly been submitted (e.g.: an option that is not present in <select> element's option list) is not considered valid and is not returned.
As the values returned by this method and by exportValues() are expected to be immediately processed and/or stored somewhere, values for file elements that obviously have special processing needs are not returned.
Table 47-1. Possible PEAR_Error values
|Error code||Error message||Reason||Solution|
|QUICKFORM_NONEXIST_ELEMENT||Element '$element' does not exist in HTML_QuickForm::exportValue()||Tried to get a value of a non-existant element||Check the element's name spelling|