PHP 在我的购物车上每页只显示 2 件商品

Question

我有一个工作脚本，它使用多维数组并将我的数据库中的项目引入用户购物车，但是列表不断增长。我只想在购物车中显示 2 件商品，如果购物车中的商品大于 2，则加载接下来的两页。

这是引入购物车项目的工作代码。

$cartoutput = "";
if(!isset($_SESSION["cart_array"]) || count($_SESSION["cart_array"]) < 1){
    $cartoutput = "<font>Your Cart is currently empty.</font>";
}
else{
    $i=0;
    foreach($_SESSION["cart_array"] as $each_item){
        $i++;
        $cartoutput .="<h2>Cart Item $i</h2>";
        while(list($key, $value) = each($each_item)){
            $cartoutput .="$key: $value <br /><br />";
        }

    }
}

这是我尝试过的方法：无法正常工作：

if(!isset($_SESSION["cart_array"]) || count($_SESSION["cart_array"]) > 2){
    $start = (isset($_GET['start']) ? (int)$_GET['start'] : 0); //setting the get function for pagnation

echo "<table width=\"1024\" align=\"center\" >";
    echo "<tr height=\"50\"></tr>";
    echo "<tr>";


$count = $_SESSION["cart_array"]; 
    $prev = $start - 2;
    if ($prev >= 0) {
        echo '<td><a href="?start=' . $prev . '">Previous Items</a></td>';
    }                                                                     

    $next = $start + 2;
    if ($next < $count) {
        echo '<td><a href="?start=' . $next . '">Next Items</a></td>';
    }                                                                 

echo "</tr>";    
echo "</table>";
}

谁能告诉我如何将用户项目限制为每页 2 个，如果超过 2 个，添加下一个和上一个按钮？

谢谢

Answer 1

我认为你有一个小问题。而不是
$count = $_SESSION["cart_array"];

我认为你的意思是：
$count = count($_SESSION["cart_array"]);

Answer 2

        <?php
        session_start();

        $_SESSION['cart_array_start'] = $_GET['start'] ;

        $_SESSION['cart_array'] = array("a", "b", "c", "d", "e", "f", "g", "h",         "i");


        $cartoutput = "";
        if(!isset($_SESSION["cart_array"]) || count($_SESSION["cart_array"]) < 1){
            $cartoutput = "<font>Your Cart is currently empty.</font>";
        }
        else{
            $i=0;
            //set our start session to 1 if it doesn't exist.
            if (!isset($_SESSION['cart_array_start'])){
                $_SESSION['cart_array_start'] = 1 ;
            }
            $first_product = $_SESSION['cart_array_start'] ;
            //echo $first_product ;
            $last_product = $_SESSION['cart_array_start'] + 1 ;
            foreach($_SESSION["cart_array"] as $each_item){

                $i++;
                //echo $i ;
                if ($i == $first_product || $i == $last_product){
                    $cartoutput .="<h2>Cart Item $i</h2>";
                    $key = $i - 1 ;
                    $cartoutput .="$key: $each_item <br /><br />";

                }

            }
        }

        echo $cartoutput ;

        //code to start at the previous page.
        if (empty($_SESSION['cart_array_start']) || $_SESSION['cart_array_start'] <= 2)        {
            //they dont get a back button because they are on the first page.
        }else{
            $back = $_SESSION['cart_array_start'] - 2 ;
            echo "<a href=\"test.php?start=" . $back . "\">Back one page</a><br />";
        }

        //next page code.
        if (count($_SESSION['cart_array']) > 2){
            //start to display it - but lets check to see if they are on the last page         first.
            $next = $_SESSION['cart_array_start'] + 2 ;
            //give our product in cart count plus one because we want to display the         last page even if it only has 1 product.
            $products = count($_SESSION['cart_array']) + 1 ;
            if ($next > $products){
                //do nothing because nothing will be on that page.
            }else{
                //give them a next button.
                echo "<a href=\"test.php?start=" . $next . "\">next page</a>";
            }
        }
        ?>