taxonomy-sehir.php

<?php
$sehiri = get_queried_object();
if($sehiri->parent != 0 ) {
	$ilce_selected = get_queried_object()->slug;
	$yazi = get_queried_object()->name ." İlanlar";
} else {
	$sehir_selected = get_queried_object()->slug;
	$yazi = get_queried_object()->name ." İlanlar";
	$child = get_queried_object()->term_id;
}
?>
<form action="<?php esc_url(bloginfo('url')); ?>/" method="get">
	<?php
	$args = array(
		'taxonomy' => 'sehir',
		'name' => 'sehir',
		'show_option_all' => 'Şehir Seçiniz',
		'hierarchical' => 1,
		'depth' => 1,
		'show_count' => 0,
		'orderby' => 'name',
		'order' => 'ASC',
		'echo' => 0,
		'value_field' => 'slug',
		'hide_empty' => 1,
		'selected' => $sehir_selected
	);
	$select = wp_dropdown_categories($args);
	$select = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select);
	echo $select;
	?>
	<noscript><input class="rtd-btn primary" type="submit" value="View" /></noscript>
</form>
<form action="<?php esc_url(bloginfo('url')); ?>/" method="get">
	<?php
	$args2 = array(
		'taxonomy' => 'sehir',
		'name' => 'ilce',
		'show_option_all' => 'İlçe Seçiniz',
		'hierarchical' => 1,
		'depth' => 1,
		'show_count' => 0,
		'orderby' => 'name',
		'order' => 'ASC',
		'echo' => 0,
		'value_field' => 'slug',
		'hide_empty' => 1,
		'selected' => $ilce_selected,
		'child_of' => $child
	);
	$select2 = wp_dropdown_categories($args2);
	$select2 = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select2);
	echo $select2;
	?>
	<noscript><input class="rtd-btn primary" type="submit" value="View" /></noscript>
</form>
<h1><?php echo $yazi; ?></h1>