MIME::Field::ContType - phpMan

NAME
    MIME::Field::ContType - a "Content-type" field

DESCRIPTION
    A subclass of Mail::Field.

    *Don't use this class directly... its name may change in the future!*
    Instead, ask Mail::Field for new instances based on the field name!

SYNOPSIS
        use Mail::Field;
        use MIME::Head;

        # Create an instance from some text:
        $field = Mail::Field->new('Content-type',
                                  'text/HTML; charset="US-ASCII"');

        # Get the MIME type, like 'text/plain' or 'x-foobar'.
        # Returns 'text/plain' as default, as per RFC 2045:
        my ($type, $subtype) = split('/', $field->type);

        # Get generic information:
        print $field->name;

        # Get information related to "message" type:
        if ($type eq 'message') {
            print $field->id;
            print $field->number;
            print $field->total;
        }

        # Get information related to "multipart" type:
        if ($type eq 'multipart') {
            print $field->boundary;            # the basic value, fixed up
            print $field->multipart_boundary;  # empty if not a multipart message!
        }

        # Get information related to "text" type:
        if ($type eq 'text') {
            print $field->charset;      # returns 'us-ascii' as default
        }

PUBLIC INTERFACE
    boundary
        Return the boundary field. The boundary is returned exactly as given
        in the "Content-type:" field; that is, the leading double-hyphen
        ("--") is *not* prepended.

        (Well, *almost* exactly... from RFC 2046:

           (If a boundary appears to end with white space, the white space
           must be presumed to have been added by a gateway, and must be deleted.)

        so we oblige and remove any trailing spaces.)

        Returns the empty string if there is no boundary, or if the boundary
        is illegal (e.g., if it is empty after all trailing whitespace has
        been removed).

    multipart_boundary
        Like "boundary()", except that this will also return the empty
        string if the message is not a multipart message. In other words,
        there's an automatic sanity check.

    type
        Try real hard to determine the content type (e.g., "text/plain",
        "image/gif", "x-weird-type", which is returned in all-lowercase.

        A happy thing: the following code will work just as you would want,
        even if there's no subtype (as in "x-weird-type")... in such a case,
        the $subtype would simply be the empty string:

            ($type, $subtype) = split('/', $head->mime_type);

        If the content-type information is missing, it defaults to
        "text/plain", as per RFC 2045:

            Default RFC 2822 messages are typed by this protocol as plain text in
            the US-ASCII character set, which can be explicitly specified as
            "Content-type: text/plain; charset=us-ascii".  If no Content-Type is
            specified, this default is assumed.

        Note: under the "be liberal in what we accept" principle, this
        routine no longer syntax-checks the content type. If it ain't empty,
        just downcase and return it.

NOTES
    Since nearly all (if not all) parameters must have non-empty values to
    be considered valid, we just return the empty string to signify missing
    fields. If you need to get the *real* underlying value, use the
    inherited "param()" method (which returns undef if the parameter is
    missing).

SEE ALSO
    MIME::Field::ParamVal, Mail::Field

AUTHOR
    Eryq (eryq AT zeegee.com), ZeeGee Software Inc (http://www.zeegee.com).
    Dianne Skoll (dfs AT roaringpenguin.com) http://www.roaringpenguin.com