试试这个。它会起作用的。

$prepare_guery = $wpdb->prepare( "SELECT post_id FROM $wpdp->posts where meta_key =\'_Wps_crossells\' and meta_value like \'%%d%\'", $meta_value );
$get_values = $wpdb->get_col( $prepare_guery );

global $wpdb;

$tbl = $wpdb->prefix.\'postmeta\';

$prepare_guery = $wpdb->prepare( "SELECT post_id FROM $tbl where meta_key =\'_Wps_crossells\' and meta_value like \'%%d%\'", $meta_value );

$get_values = $wpdb->get_col( $prepare_guery );