Simple SEO/User friendly search

case-study-results.php

<?php 
  

	function excel_case_study_results($posts) {
    /*
      this function is called in the content area of 
      either the post type archive template or
      the either taxonomy archive template like this
      
    					if (have_posts()) {
    						?>
    							<div id="case-study-list">
    								<?php excel_case_study_results($posts); ?>
    							</div>
    							<div id="case-study-load-more-div" class="case-study-load-more" style="visibility: hidden;">
    								<a href="#" id="case-study-load-more-a">Load More</a>
    							</div>
    						<?php
    					} else {
    						?><div id="case-study-list no-results"><p>No Results Found</p></div><?php
    					}
              
       in addition to this there is a JS file added here to loading more results
      
    */
		global $post;
		$count = 0;
		$row_closed = true;
		foreach ($posts as $post) {
			setup_postdata($post);
			if (($count % 2) == 0) {
				$row_closed = false;
				?>
					<div class="row">
				<?php
			}
			$classes = array('col-lg-6', 'col-md-6', 'col-sm-6', 'col-xs-12');
			$title = get_the_title();
			if (get_field('title')) {
				$title = get_field('title');
			}
			$background = NULL;
			$image_id = get_field('featured_image', false, false);
			if ($image_id) {
				$image = wp_get_attachment_image_src($image_id, 'persona-xl');
				if ($image) {
					$background = $image[0];
				}
			}
			?>
				<article id="post-<?php the_ID(); ?>" <?php post_class($classes); ?>>
					<a href="<?php the_permalink(); ?>" <?php if ($background) { echo 'style="background-image:url(' . $background . ')";'; } ?>>
                        <div class="item-excerpt">
                            <h2><?php the_title(); ?></h2>
    						<p class="excerpt"><?php the_field('excerpt'); ?></p>
    						<p class="learn-more"><?php
    							if (get_field('has_video')) {
    								?><i class="fa fa-play-circle"></i><?php
    							}
    						?>View Case Study</p>
                        </div>
					</a>
				</article>
			<?php
			if (($count % 2) != 0) {
				$row_closed = true;
				?>
					</div>
				<?php
			}
			$count++;
		} // end foreach post
		if (!$row_closed) {
			echo '</div>';
		}
		wp_reset_postdata();
	} // end function excel_case_study_results

	add_filter('pre_get_posts', 'case_study_pre_get_posts');
	function case_study_pre_get_posts($query) {
    /*
        this is the pre_get_posts filter for this section
        you can see that if we're doing ajax then it uses the post values
        but if ajax is not being done it does not alter the query.
    */
		if (defined('DOING_AJAX') && DOING_AJAX &&
				isset($query->query_vars['post_type']) && $query->query_vars['post_type'] == 'case-study') {
			$tax_query = array();
			if (isset($_GET['case-study-solution']) && $_GET['case-study-solution'] != '') {
				$tax_query[] = array(
					'taxonomy' => 'solution',
					'terms' => array(intval($_GET['case-study-solution']))
				);
			}
			if (isset($_GET['case-study-industry']) && $_GET['case-study-industry'] != '') {
				$tax_query[] = array(
					'taxonomy' => 'industry',
					'terms' => array(intval($_GET['case-study-solution']))
				);
			}
			if (count($tax_query)) {
				$tax_query['relation'] = 'AND';
				$query->set('tax_query', $tax_query);
			}
			if (isset($_GET['case-study-page'])) {
				$query->set('paged', intval($_GET['case-study-page']));
			}
		} elseif (is_admin()) {
			return;
		}
		if (isset($query->query_vars['post_type']) && $query->query_vars['post_type'] == 'case-study') {
			$query->set('posts_per_page', 6);
			if (!isset($_GET['case-study-page'])) {
				$query->set('paged', 1);
			}
			$query->set('orderby', array('memu_order' => 'ASC', 'title' => 'ASC'));
		}

	} // end case_study_pre_get_posts

form-case-study-search.php

<?php 
	/* 
		This is the search form.
		The same search form is used in the post type archive template
		the taxonomy archive templates in two taxonomies
		and this file is loaded using:
		get_template_part('template-parts/form', 'case-study-search');
	*/
	$queried_object = get_queried_object();
	$current_tax = false;
	$current_term = false;
	if (isset($queried_object->term_id)) {
		$current_tax = $queried_object->taxonomy;
		$current_term = $queried_object->term_id;
	}
?>
<div id="case-studies-search-bar">
	<p class="search-bar-text hidden-xs">
		<?php the_field('search_bar_text', 141); ?>
	</p>
	<form id="case-studies-search" name="case-studies-search" action="">
		<span class="form-label">Filter By:</span>
		<input type="hidden" name="case-study-page" id="case-study-page" value="<?php
				if ($wp_query->max_num_pages == 0) {
					echo 0;
				} else {
					echo 1;
				}
			?>" />
		<input type="hidden" name="case-study-pages" id="case-study-pages" value="<?php echo $wp_query->max_num_pages; ?>" />
		<?php
			// solutions
			$tax = 'solution';
			$args = array(
				'taxonomy' => $tax,
				'hide_empty' => false
			);
			$terms = get_terms($args);
			if (count($terms)) {
				?>
					<select name="case-study-solution" id="case-study-solution" class="selectpicker">
						<option value=""<?php
							if ($current_tax != $tax || ($current_tax == $tax && $current_term != $term->term_id)) {
								?> selected="selected"<?php
							}
						?>>Solutions</option>
						<?php
							foreach ($terms as $term) {
								?>
									<option value="<?php echo $term->term_id; ?>"<?php
											if ($current_tax == $tax && $current_term == $term->term_id) {
												?> selected="selected"<?php
											}
											?>><?php echo $term->name; ?></option>
								<?php
							}
						?>
					</select>
				<?php
			}

			// industries
			$tax = 'industry';
			$args = array(
				'taxonomy' => $tax,
				'hide_empty' => false
			);
			$terms = get_terms($args);
			if (count($terms)) {
				?>
					<select name="case-study-industry" id="case-study-industry" class="selectpicker">
						<option value=""<?php
							if ($current_tax != $tax || ($current_tax == $tax && $current_term != $term->term_id)) {
								?> selected="selected"<?php
							}
						?>>Industries</option>
						<?php
							foreach ($terms as $term) {
								?>
									<option value="<?php echo $term->term_id; ?>"<?php
											if ($current_tax == $tax && $current_term == $term->term_id) {
												?> selected="selected"<?php
											}
											?>><?php echo $term->name; ?></option>
								<?php
							}
						?>
					</select>
				<?php
			}
		?>
	</form>
</div>