<select id="inventar" name="inventar">
<option value"">Инвентарь</option>
<option value"Коньки">Коньки</option>
<option value"Лыжи">Лыжи</option>
<option value"Велосипед">Велосипед</option>
<option value"Ролики">Ролики</option>
</select>
<select id="park" name="park">
<option value"">Парк</option>
<option value"Горького">Горького</option>
<option value"Сокольники">Сокольники</option>
<option value"ВДНХ">ВДНХ</option>
<option value"Царицино">Царицино</option>
</select>
<input type="hidden" name="source" value="bb"><button type="submit" class="search-button form-inline btn btn-primary btn-large" id="submit_location">
Начать поиск
</button>
<form action="/" method="get" role="search">
<select name="inventar">
<?php
$categories = get_categories(array(
'child_of' => 2 // если не знаешь ID то - get_category_by_slug( 'inventar' )->cat_ID
));
foreach($categories as $category): ?>
<option value = "<?=$category->cat_ID ?>"><?=$category->cat_name ?></option>
<?php endforeach ?>
</select>
<select name="park">
<?php
$categories = get_categories(array(
'child_of' => 3 // get_category_by_slug( 'park' )->cat_ID
));
foreach($categories as $category): ?>
<option value = "<?=$category->cat_ID ?>"><?=$category->cat_name ?></option>
<?php endforeach ?>
</select>
<input type="hidden" name="source" value="bb">
<button type="submit">Начать поиск</button>
</form>add_filter('pre_get_posts', function($query){
if(isset($_GET['source']) && $_GET['source'] == 'bb'){
$query->set( 'category__and', array(
$_GET['inventar'],
$_GET['park']
) );
}
});
<form role="search" method="get" id="searchform" action="<?php bloginfo('siteurl'); ?>">
<div>
<label class="screen-reader-text" for="s">Ищем:</label>
<input type="text" value="" name="s" id="s" />
in <?php wp_dropdown_categories( 'show_option_all=All Categories' ); ?>
<input type="submit" id="searchsubmit" value="Искать" />
</div>
</form>
Средний
Простой
Средний
Простой