Search result by range?

Question

I have to search for posts that have in tags or custom fields a number(price): example 152. Each post have a price tag. How I do to search for all post greater than a price for example I need to search for all post who have a price tag of minimum 100.

Something like /?s=keyword&price>=300

Thx

Answer 1

If you save the the price in a meta field, you can query posts using meta_query:

<?php
    $the_posts = new WP_Query( array(
        'meta_key' => 'price',
        'orderby' => 'meta_value_num',
        'order' => 'ASC',
        'meta_query' => array(
            array(
                'key' => 'price',
                'value' => '100',
                'type' => 'NUMERIC',
                'compare' => '>='
            )
        )
    ));
?>
<?php while ( $the_posts->have_posts() ) : $the_posts->the_post(); ?>
    <h1><?php the_title(); ?></h1>
<?php endwhile; wp_reset_query(); ?>

Answer 2

If the price is stored as a custom field you'll need to use the meta_query argument of WP_Query (see Codex). For instance:

 //Get posts with custom field 'price' between 20 and 100
 $price_filtered = WP_Query(array(
     'meta_query'=>array(
         array(
            'key' => 'price',
            'value' => array( 20, 100 ),
            'type' => 'numeric',
            'compare' => 'BETWEEN'
         ),
      )
 ));

(where price is the key of the custom field). Depending on how you might be implementing this (is it intended to be the 'main query' or not - you might want to use this at pre_get_posts)

Edit

If filtering a search result:

add_action('pre_get_posts', 'wpse71814_filter_search');
function wpse71814_filter_search( $query ){
     if( $query->is_search() && isset($_GET['min']) ){

         //Collect user input from $_GET for example
         $user_input_min_value = $_GET['min'];

         $meta_query = $query->get('meta_query');

         $meta_query[] = array(
            'key' => 'price',
            'value' => $user_input_min_value,
            'type' => 'NUMERIC',
            'compare' => '>='
         );

         $query->set('meta_query',$meta_query);
      }
}

Note: The original answer had a meta query which specified a range. The second answer has a meta query which filters for prices above some minimum value.

Usage: /?s=keyword&min=300