Create A Filter Based On Query Strings For Relationships

gistfile1.php

<?php
//***********************************************************/
// CREATE A FILTER BASED ON QUERY STRINGS FOR RELATIONSHIPS //
// URL FOR THIS EXAMPLE: /?practice_area=92,88&lawyer=69    //
//***********************************************************/

// Get the query string for practice areas
$pas = explode(',', $_GET['practice_area']);
$lawyers = explode(',', $_GET['lawyer']);

// Set the original variable for the query
$meta_query = array();

// Check if the user is trying to get practice areas
if (isset($_GET['practice_area'])) {
	foreach($pas as $panum){
		$pID = '"' . $panum . '"';
		$meta_query[] = array('key' => 'rel_practice_area','value' => "$pID",'compare' => 'LIKE');
	}
}

// Check if the user is trying to get lawyers
if (isset($_GET['lawyer'])) {
	foreach($lawyers as $lnum){
		$lID = '"' . $lnum . '"';
		$meta_query[] = array('key' => 'rel_attorney','value' => "$lID",'compare' => 'LIKE');
	}
}

// Query the relationship - With Pagination.
$relcases = new WP_Query(array('post_type'=>'verdicts','posts_per_page'=>'10','paged'=>get_query_var('paged'),'meta_query'=>$meta_query)
);

// Check if there are any relationships
if($relcases->found_posts){

	// The loop
	while ( $relcases->have_posts() ) : $relcases->the_post();
		get_template_part( 'content', 'verdicts' );
	endwhile; ?>
	
	<?php // Pagination ?>
	<div class="blog-nav">
		<?php
		$big = 999999999; // need an unlikely integer

		echo paginate_links( array(
			'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
			'format' => '?paged=%#%',
			'current' => max( 1, get_query_var('paged') ),
			'total' => $relcases->max_num_pages
		) );
		?>
	</div>
	
	<?php
	} else { ?>
	<h2>Sorry, nothing was found</h2>
<?php
}
wp_reset_postdata(); // Reset the post
?>