我将2个类别拉入2个下拉列表。当我点击提交时，URL会显示过滤，但它只是加载主页。我希望用户能够选择多个类别并提交以显示结果。

    <?php $price = array(
    \'show_option_all\'    => \'\',
    \'show_option_none\'   => \'Price Range:\',
    \'orderby\'            => \'ID\', 
    \'order\'              => \'ASC\',
    \'show_count\'         => 1,
    \'hide_empty\'         => 1, 
    \'child_of\'           => 110,
    \'exclude\'            => \'\',
    \'echo\'               => 1,
    \'selected\'           => 0,
    \'hierarchical\'       => 1, 
    \'name\'               => \'price\',
    \'id\'                 => \'\',
    \'class\'              => \'styled-select\',
    \'depth\'              => 0,
    \'tab_index\'          => 0,
    \'taxonomy\'           => \'category\',
    \'hide_if_empty\'      => false
    ); ?>

    <?php $region = array(
    \'show_option_all\'    => \'\',
    \'show_option_none\'   => \'Region:\',
    \'orderby\'            => \'ID\', 
    \'order\'              => \'ASC\',
    \'show_count\'         => 1,
    \'hide_empty\'         => 1, 
    \'child_of\'           => 32,
    \'exclude\'            => \'\',
    \'echo\'               => 1,
    \'selected\'           => 0,
    \'hierarchical\'       => 1, 
    \'name\'               => \'region\',
    \'id\'                 => \'\',
    \'class\'              => \'styled-select\',
    \'depth\'              => 0,
    \'tab_index\'          => 0,
    \'taxonomy\'           => \'category\',
    \'hide_if_empty\'      => false
    ); ?>

    <div class="search">

    <form method="get" action="<?php bloginfo(\'siteurl\'); ?>" id="category" >

    <div class="four columns">
    <div class="search_drop"><?php wp_dropdown_categories( $price); ?> </div>
    </div>

    <div class="four columns">
    <div class="search_drop"><?php wp_dropdown_categories( $region); ?> </div>
    </div>

    <div class="four columns">
    <input type="submit" name="submit" value="Filter" class="button" /></form>
    </div>

    </div>