下面带有“\'taxonomy\'=>\'age\'”的数组不起作用，如果我复制并粘贴数组“array（\'19\'，\'20\'）”来代替变量，它就可以正常工作。我刚开始学习PHP，所以请对我放松：）

                if($_REQUEST["price"] == 19){$price = "\'19\'";}
                elseif($_REQUEST["price"] == 20){$price = "array( \'19\', \'20\' )";}
                elseif($_REQUEST["price"] == 21){$price = "array( \'19\', \'20\', \'21\' )";}
                elseif($_REQUEST["price"] == 22){$price = "array( \'19\', \'20\', \'21\', \'22\' )";}
                elseif($_REQUEST["price"] == 23){$price = "array( \'19\', \'20\', \'21\', \'22\', \'23\' )";}
                echo $price;
                $my_query = new WP_Query( array(
                            \'post_status\' => \'publish\',
                            \'post_type\' => \'post\', 
                            \'cat\' => \'\' . $_REQUEST["category"] . \'\',
                            \'tax_query\' => array(
                                    \'relation\' => \'OR\',
                                    array(
                                        \'taxonomy\' => \'age\',
                                        \'field\' => \'id\',
                                        \'terms\' => \'\' . $_REQUEST["age"] . \'\'
                                    ),
                                    array(
                                        \'taxonomy\' => \'price\',
                                        \'field\' => \'id\',
                                        \'terms\' => $price,
                                        \'operator\' => \'IN\'
                                    ),
                                    array(
                                        \'taxonomy\' => \'group\',
                                        \'field\' => \'id\',
                                        \'terms\' => \'\' . $_REQUEST["group"] . \'\'
                                    )
                                ),
                            \'posts_per_page\' => \'-1\'
                            ) );