窗口位置重新加载无限PHP

我创建了一个"添加到购物车"按钮，窗口位置设置为重新加载。但当我点击它时，它会无限地重新加载，或者永远不会停止。我只需要重新加载它，这样我仍然可以浏览更多的项目添加到我的购物车。我怎样才能把它设置在同一页上?

<?php
session_start();
$connect = mysqli_connect("localhost", "root", "", "tut");
if (isset($_POST["add"])) {
    if (isset($_SESSION["cart"])) {
        $item_array_id = array_column($_SESSION["cart"], "product_id");
        if (!in_array($_GET["id"], $item_array_id)) {
            $count = count($_SESSION["cart"]);
            $item_array = array(
                'product_id' => $_GET["id"],
                'item_name' => $_POST["hidden_name"],
                'product_price' => $_POST["hidden_price"],
                'item_quantity' => $_POST["quantity"]
            );
            $_SESSION["cart"][$count] = $item_array;
            echo '<script>window.location.reload()</script>';
        }
        else {
            echo '<script>alert("Products already added to cart")</script>';
            echo '<script>window.location.reload()</script>';
        }
    }
    else {
        $item_array = array(
            'product_id' => $_GET["id"],
            'item_name' => $_POST["hidden_name"],
            'product_price' => $_POST["hidden_price"],
            'item_quantity' => $_POST["quantity"]
        );
        $_SESSION["cart"][0] = $item_array;
    }
}
if (isset($_GET["action"])) {
    if ($_GET["action"] == "delete") {
        foreach($_SESSION["cart"] as $keys => $values) {
            if ($values["product_id"] == $_GET["id"]) {
                unset($_SESSION["cart"][$keys]);
                echo '<script>alert("Product has been removed")</script>';
                echo '<script>window.location.reload()</script>';
            }
        }
    }
}