以下函数需要放入函数中。php的模板代码。或者在插件中。

function custom_search_query( $request ) {
    $query = new WP_Query();  // the query isn\'t run if we don\'t pass any query vars
    $query->parse_query($request);

    $request[\'post_type\'] = \'LAW\';

    // this is the actual manipulation; do whatever you need here
    if(isset($_GET[\'search\']))
        $options = $_GET[\'search\'];
    if (!empty($options)) {
        $i = 0;
        $request[\'meta_query\'] = array(); // resetting any previously selected meta_queries that might "linger" and cause weird behaviour.
        // CAREFUL HERE ^ might not be desired behaviour

        foreach($options AS $key => $value) {
            $request[\'meta_query\'][$i][\'key\'] = $key;
            $request[\'meta_query\'][$i][\'value\'] = array($value);
            $request[\'meta_query\'][$i][\'compare\'] = \'IN\';
            $request[\'meta_query\'][$i][\'type\'] = \'CHAR\';
            $i++;
        }
    }

    return($request);
}
add_filter( \'request\', \'custom_search_query\' );

<input type="text|number" name="search[keyname1]" value="value1" />
<input type="text|number" name="search[keyname2]" value="value2" />