function-pre-post.php

<?php  

function wpes_ajusta_leitura_e_filtros( $query ) {


    if ( $query->is_main_query() && ( is_tax( 'tipo-material' ) || is_post_type_archive("material") ) && !is_admin()) {

		$query->set( 'orderby', 'date' );
		$query->set( 'order', 'desc' );
        $query->set( 'posts_per_page', '12' );

		if(isset($_GET['sol']) || isset($_GET['prd'])) {
			$meta = array(
				'relation' => 'OR'
			);

			$ids = explode(",", $_GET['sol']);
			foreach ($ids as $value) {
				if(!$value || $value == "-1")
					continue;

				$meta[] = array(
					'key'     => 'es-material-relacao',
					'value'   => '"' . $value . '"',
					'compare' => 'LIKE'
					);
			}
			if(isset($_GET['prd'])) {

				$ids = explode(",", $_GET['prd']);
				foreach ($ids as $value) {
					if(!$value || $value == "-1")
						continue;

					$meta[] = array(
						'key'     => 'es-material-relacao',
						'value'   => '"' . $value . '"',
						'compare' => 'LIKE'
						);
				}
			}
			$query->set('meta_query', $meta);
		}

		if(isset($_GET['tp'])) {
			$tipos = array();
			$ids = explode(",", $_GET['tp']);
			foreach ($ids as $value) {
				if(!$value || $value == "-1")
					continue;

				$tipos[] = $value;
			}

			if(count($tipos)) {

				$query->set('tax_query', array(
					array(
						'taxonomy' => 'tipo-material',
						'field' => 'id',
						'terms' => $tipos
						)));
			}
		}
    }
}

add_action( 'pre_get_posts', 'wpes_ajusta_leitura_e_filtros' );

function wpes_template_chooser($template){
	global $wp_query;
	if( $wp_query->is_search && $_GET['post_type'] == 'material' ) {
		$wp_query->set('post_type', 'material');
		return locate_template('archive-material.php');
	}
		
	return $template;

}

add_filter('template_include', 'wpes_template_chooser');

?>