wordpress - How to set custom filler for product attributes like SIZE,COLOUR,PRICE,etc -

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how set custom fillter product attributes size,colour,price,etc , knw there many plugin want custom code fillter.

product attributes rows in table wp_postmeta. can select corresponding posts building query on tables wp_posts , wp_postmeta. here example using $wpdb->prepare() , $wpdb->get_results():

$posts = $wpdb->get_results( $wpdb->prepare(     "select p.* {$wpdb->posts} p, {$wpdb->postmeta} m ".     "where p.id = m.post_id , m.meta_key = %s , m.meta_value = %s ".     "and p.post_status = 'publish' ".      "and p.post_type = '<your_post_type>',     array($attribute_name, $attribute_value) ) );

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