php - Wordpress get_posts() fetch posts with empty custom field -

i'm trying use get_posts() function in wordpress retrieve list of posts if have empty custom field, called wpcf-translated-details

here current code:

    <?php     require_once('wp-load.php');     $temp_list_of_products_array        = get_posts( array('post_type' => 'sale', 'numberposts' => 10 ) );     $temp_list_of_products_array_length = count( $temp_list_of_products_array );      ($xt = 0; $xt < $temp_list_of_products_array_length; $xt++) {         $temp_product_id                    = $temp_list_of_products_array[$xt]->id;         $temp_product_untranslated_field    = get_post_meta($temp_product_id, 'wpcf-product-details', true);         $temp_product_translated_field      = get_post_meta($temp_product_id, 'wpcf-translated-product-details', true);         $temp_product_description_language  = 'en';          if ($temp_product_translated_field == null) {             $temp_product_translated_contents   = google_translate_text($temp_product_untranslated_field, $temp_product_description_language);             update_post_meta($temp_product_id, 'wpcf-translated-product-details', $temp_product_translated_contents);         }          echo $temp_product_id;     }     ?> 

but couldn't find method or instructions on how achieve this.

so question is, how can modify code fetches 10 posts have empty wpcf-translated-details custom field?

thanks

you can check meta_query parameter wp_query here.

$posts = new wp_query(     array('post_type' => 'sale',         'numberposts' => 10,         'meta_query' => array(             array(                 'key' => 'wpcf-translated-details',                 'value' => '',                 'compare' => '=',             )         )     ) );