WordPress taxonomy query

wordpress-taxonomy-query.php

<?php
/**
 * The template used for displaying page content
 *
 * @package WordPress
 * @subpackage Twenty_Fifteen
 * @since Twenty Fifteen 1.0
 */


$postCity = $_POST['city']; 
$postJob = $_POST['job'];
?>

<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
	<?php
		// Post thumbnail.
		twentyfifteen_post_thumbnail();
	?>

	<header class="entry-header">
		<?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>

	</header><!-- .entry-header -->

	<div class="entry-content">


		<form action="http://localhost/ustapro.com/listeleme-sayfasi/" method="POST">
			<select name="city" id="city">
				<option value=""><?php _e('--- Sec ---','twentyfifteen'); ?></option>
				<?php
				//list terms in a given taxonomy
				$taxonomy = 'category';
				$tax_terms = get_terms($taxonomy);
				?>	
				<?php foreach ($tax_terms as $tax_term): ?>
					<?php 
						if( $tax_term->slug == $postCity){
							$selected = 'selected';
						}else{
							$selected = '';
						}
					?>
					<option value="<?=$tax_term->slug ?>" <?=$selected?>><?=$tax_term->name ?></option>
				<?php endforeach; ?>
			</select>
			<br/>

			<select name="job" id="job">
				<option value=""><?php _e('--- Sec ---','twentyfifteen'); ?></option>
				<?php
				//list terms in a given taxonomy
				$taxonomy = 'post_job';
				$tax_terms = get_terms($taxonomy);
				?>	
				<?php foreach ($tax_terms as $tax_term): ?>
					<?php 
						if( $tax_term->slug == $postJob){
							$selected = 'selected';
						}else{
							$selected = '';
						}
					?>
					<option value="<?=$tax_term->slug ?>" <?=$selected?>><?=$tax_term->name ?></option>
				<?php endforeach; ?>
			</select>
			<br/>

			<input type="submit" class="submit" value="Gönder">

		</form>	

		<?php 

			if ( $postCity ){
				$taxQueryCity = array(
								'taxonomy' => 'category',
								'field'    => 'slug',
								'terms'    => $postCity,
							);					
			}else{
				$taxQueryCity = array();
			}

			if ( $postJob ){
				$taxQueryJob = array(
								'taxonomy' => 'post_job',
								'field'    => 'slug',
								'terms'    => $postJob,
							);					
			}else{
				$taxQueryJob = array();
			}

			

		?>

		<?php $the_query = new WP_Query( array( 
			                                    'post_type'    		=> 'post', 
			                                    'orderby'      		=> 'date', 
			                                    'order'        		=> 'DESC',
			                                    'posts_per_page' 	=> 10,			                                    
			                                    'tax_query' 		=> array( 
			                                    						$taxQueryCity, 
			                                    						$taxQueryJob) 

												) ); ?>

		<?php if ( $the_query->have_posts($the_query) ) : while ( $the_query->have_posts() ) : $the_query->the_post(); ?>

			<h4><?php echo get_the_title(); ?></h4>

		<?php endwhile; endif; wp_reset_postdata(); ?>

	</div><!-- .entry-content -->

	<?php edit_post_link( __( 'Edit', 'twentyfifteen' ), '<footer class="entry-footer"><span class="edit-link">', '</span></footer><!-- .entry-footer -->' ); ?>

</article><!-- #post-## -->