WordPress的做法是使用query_vars 因此，首先将变量添加到数组中：

//add to query vars
function add_query_vars($vars) {
    $new_vars = array(\'custom_method\',\'cm_parameter\');
    $vars = $new_vars + $vars;
    return $vars;
}

add_filter(\'query_vars\', \'add_query_vars\');

global $wp; 
    if (array_key_exists(\'custom_method\', $wp->query_vars) && isset($wp->query_vars[\'custom_method\'])){
      //do your stuff
    }