我可以在我的索引页面上添加产品，但在我的所有产品页面中，以及在我搜索时，它只刷新页面，但不添加产品。所以我尝试为我的所有产品页面创建一个不同的功能。但它仍然没有进入购物车，只是刷新了页面。为什么？
add to cart按钮的代码
<?php
$get_prod = "select * from item order by ItemName";
$run_prod = mysqli_query($con, $get_prod);
while($row_prod = mysqli_fetch_array($run_prod)){
$prod_id = $row_prod['ItemId'];
$prod_name = $row_prod['ItemName'];
$prod_desc = $row_prod['ItemDesc'];
$prod_price = $row_prod['ItemPrice'];
$prod_cat = $row_prod['ItemCat'];
$prod_img = $row_prod['ItemImg'];
echo "
<div id='single_product'>
<img src='../admin_int/product_images/$prod_img' width='180' height=180'/>
<h4>Name:</h4><h4> $prod_name</h4>
<p><b>Price: $ $prod_price</b></p>
<p><b>Quantity</b><input type='number' value='1' name='prod_quan' placeholder='1' min='1' max='9' size='2'/></p>
<a href='details.php?prod_id=$prod_id' style='float:left; font-size:19px;padding-top:10px;text-decoration:none'>Details</a>
<a href='all_products.php?prod_id=$prod_id'><button style = 'float:right; border:1; border-radius:12px; color:blue;
height:50px; width:50px;
background-color: #80ff80'>
Add to Cart</button></a>
</div>
";
}
?>
单击add to cart后要执行的操作
function AllProdcart(){
if(isset($_GET['add_cart']))
{
global $con;
$ip = getIp();
$pro_id = $_GET['add_cart'];
$prod_quan = $_POST['prod_quan'];
$check_pro = "select * from cart where ip_add = '$ip' AND p_id = '$prod_id" ;
$run_check = mysqli_query($con, $check_pro);
if(mysqli_num_rows($run_check)>0){
echo "";
}
else {
$insert_pro = "insert into cart (orderId,ip_add,qty) values ('$pro_id','$ip','$prod_quan')";
$run_pro = mysqli_query($con, $insert_pro);
echo "<script> window.open('all_products.php','_self')</script>";
}
}
}//cart()
这就是我调用函数AllProdcart(); 的地方
<!DOCTYPE html>
<?php
session_start();
include("../functions/function.php");
?>
<html>
<head>
<title>Online Shop</title>
<link rel='stylesheet' href='../CSS/style.css' media="all"/>
</head>
<body>
<!--Main Wrapper starts here!-->
<div class="main_wrapper">
<!--Header Wrapper starts here!-->
<div class="header_wrapper" >
<a href='index.php'><img id="logo" src="../Pictures/logo.png"/></a>
</div>
<!--Header ends here!-->
<!--Menu Bar starts here!-->
<div class="menubar">
<ul id="menu">
<li><a href="index.php"> Home </a></li>
<li><a href="all_products.php"> All Products </a></li>
<li><a href="cart.php"> Shopping Cart </a></li>
</ul>
<div id="form">
<form method="get" action="results.php" enctype="multipart/form-data">
<input type="text" name="user_query" placeholder="Search Product"/>
<input type="submit" name="search" value="search" style='background-color:#80dfff; border:none;'/>
</form>
</div>
</div><!--Menubar ends here!-->
<!--Content Wrapper here!-->
<div class="content_wrapper">
<div id="sidebar">
<div id="sidebar_title"> Categories</div>
<ul id="cats">
<?php getCats(); ?>
</ul>
</div>
<!--CONTENT AREA starts here-->
<div id="content_area">
<?php AllProdcart(); ?>
<div id='shopping_cart'>
<span style='float:right; font-size:18px; padding-right:5px; padding:5px; line-height:40px;'>
<?php
if(isset($_SESSION['customer_email'])){
echo "<b>Welcome: </b> ". $_SESSION['customer_email'] . "<b style='color:#336600;'> Your</b>";
}else{
echo " Welcome Guest!";
}
?>
<b style='color:#336600'>SHOPPING CART</b>
Total Items:<?php total_items(); ?>
Total Price: <?php total_price(); ?>
<a href="cart.php" style='color:#336600'>Go to Cart</a>
<?php
if(!isset($_SESSION['customer_email'])){
echo "<a href='checkout.php' style='color:#336600;'>Login</a>";
}
else{
echo "<a href='logout.php' style='color:#336600;'>Logout</a>";
}
?>
</span>
</div>
<div id="product_box">
<!--CODE IN SHOWING ALL PRODUCTS-->
<?php
$get_prod = "select * from item order by ItemName";
$run_prod = mysqli_query($con, $get_prod);
while($row_prod = mysqli_fetch_array($run_prod)){
$prod_id = $row_prod['ItemId'];
$prod_name = $row_prod['ItemName'];
$prod_desc = $row_prod['ItemDesc'];
$prod_price = $row_prod['ItemPrice'];
$prod_cat = $row_prod['ItemCat'];
$prod_img = $row_prod['ItemImg'];
echo "
<div id='single_product'>
<img src='../admin_int/product_images/$prod_img' width='180' height=180'/>
<h4>Name:</h4><h4> $prod_name</h4>
<p><b>Price: $ $prod_price</b></p>
<p><b>Quantity</b><input type='number' value='1' name='prod_quan' placeholder='1' min='1' max='9' size='2'/></p>
<a href='details.php?prod_id=$prod_id' style='float:left; font-size:19px;padding-top:10px;text-decoration:none'>Details</a>
<a href='all_products.php?prod_id=$prod_id'><button style = 'float:right; border:1; border-radius:12px; color:blue;
height:50px; width:50px;
background-color: #80ff80'>
Add to Cart</button></a>
</div>
";
}
?> <!--END OF ALL PRODUCTS-->
</div>
</div><!--END OF CONTENT AREA-->
</div><!--Content Wrapper ends here!-->
<div id="footer"><h2 style='text-align:center; padding-top:25px;'>© Jerlon Buenconsejo 2015</h2> </div>
</div><!--Wrapper-->
</body>
</html>
请参阅以下链接php.net/manual/en/mysqli.error.php<（针对您的查询）和php.net/manual/en/function.error-reporting.php，并将其应用于您的代码。–弗雷德-ii-7分钟前
我强烈建议使用这些链接（以及上面的函数）来确定您的代码中是否存在MySQL错误。
此外，在SQL语句中使用*肯定不是一个好的做法，因为它可能会在服务器上造成不必要的负载。