Where $param is a value returned by $cgi->param, this is how it's done internally: 

if (ref($param) && defined(fileno($param)) {
   is file
} else {
   isn't
}

[download]

This should also work: 

if ($cgi->uploadInfo($param)) {
   is file
} else {
   isn't
}

[download]

You only need to check if $cgi->content_type() eq 'multipart/form-data'.

In reply to Re: Detect input type = file with CGI.pm by ikegami
in thread Detect input type = file with CGI.pm by manta

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