# URI::QueryParam - phpMan

## NAME
    [URI::QueryParam] - Additional query methods for URIs

## SYNOPSIS
      use URI;
      use [URI::QueryParam];

      $u = URI->new("", "http");
      $u->query_param(foo => 1, 2, 3);
      print $u->query;    # prints foo=1&foo=2&foo=3

      for my $key ($u->query_param) {
          print "$key: ", join(", ", $u->query_param($key)), "\n";
      }

## DESCRIPTION
    Loading the "[URI::QueryParam]" module adds some extra methods to URIs
    that support query methods. These methods provide an alternative
    interface to the $u->query_form data.

    The query_param_* methods have deliberately been made identical to the
    interface of the corresponding "CGI.pm" methods.

    The following additional methods are made available:

    @keys = $u->query_param
    @values = $u->query_param( $key )
    $first_value = $u->query_param( $key )
    $u->query_param( $key, $value,... )
        If $u->query_param is called with no arguments, it returns all the
        distinct parameter keys of the URI. In a scalar context it returns
        the number of distinct keys.

        When a $key argument is given, the method returns the parameter
        values with the given key. In a scalar context, only the first
        parameter value is returned.

        If additional arguments are given, they are used to update
        successive parameters with the given key. If any of the values
        provided are array references, then the array is dereferenced to get
        the actual values.

        Please note that you can supply multiple values to this method, but
        you cannot supply multiple keys.

        Do this:

            $uri->query_param( widget_id => 1, 5, 9 );

        Do NOT do this:

            $uri->query_param( widget_id => 1, frobnicator_id => 99 );

    $u->query_param_append($key, $value,...)
        Adds new parameters with the given key without touching any old
        parameters with the same key. It can be explained as a more
        efficient version of:

           $u->query_param($key,
                           $u->query_param($key),
                           $value,...);

        One difference is that this expression would return the old values
        of $key, whereas the query_param_append() method does not.

    @values = $u->query_param_delete($key)
    $first_value = $u->query_param_delete($key)
        Deletes all key/value pairs with the given key. The old values are
        returned. In a scalar context, only the first value is returned.

        Using the query_param_delete() method is slightly more efficient
        than the equivalent:

           $u->query_param($key, []);

    $hashref = $u->query_form_hash
    $u->query_form_hash( \%new_form )
        Returns a reference to a hash that represents the query form's
        key/value pairs. If a key occurs multiple times, then the hash value
        becomes an array reference.

        Note that sequence information is lost. This means that:

           $u->query_form_hash($u->query_form_hash);

        is not necessarily a no-op, as it may reorder the key/value pairs.
        The values returned by the query_param() method should stay the same
        though.

## SEE ALSO
    URI, CGI

## COPYRIGHT
    Copyright 2002 Gisle Aas.