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Gisle Aas


URI::QueryParam - Additional query methods for URIs


  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";


Loading the URI::QueryParam module will add some extra methods to URIs that support query methods. These methods provide an alternative interface to the $u->query_form data.

The provided query_param_* methods on pupose 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 argments it returns all the distinct parameter keys of the URI. In scalar context it returns the number of distinct keys.

When a $key argument is given it returns the parameter values with the given key. In 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.

$u->query_param_append($key, $value,...)

The $u->query_param_append method 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:


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

@values = $u->query_param_delete($key)
$first_value = $u->query_param_delete($key)

This method will delete all key/value pairs with the given key. The old values are returned. In 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 )

This method will return a reference to a hash that represents the query form's key/value pairs. If a key occurs multiple times, then the hash value will become an array reference.

Note that sequence information is lost. It means that:


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




Copyright 2002 Gisle Aas.