我的代码是：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>SomuFinance - Personal Finance Manager</title>
<link rel="stylesheet" type="text/css" href="indexStyle.css">
<script src="scripts/jquery-3.1.0.min.js"></script>
<style type="text/css">
#addItemContainer {
background-color: rgba(204,207,232,1);
}
</style>
<script type="text/javascript">
var flag=0;
</script>
</head>
<body>
<form id="list" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<div id="container">
<input type="submit" class="button" name="edit" id="edit" value="Edit" />
<input type="hidden" id="action" name="action">
<table id="listDB">
<tr>
<th>Select</th>
<th>ID</th>
<th>Category ID</th>
<th>Shop</th>
<th>Item</th>
<th>Quantity</th>
<th>Unit</th>
<th>Price Based On</th>
<th>MRP</th>
<th>Seller's Price</th>
<th>Last Updated On</th>
</tr>
<?php
$dbc = mysqli_connect('localhost','root','atlantis2016','itemDB')
or die("Error Connecting to Database");
$query1 = "SELECT DISTINCT category FROM grocery";
$result1 = mysqli_query($dbc, $query1)
or die("Error Querying Database");
while($row = mysqli_fetch_array($result1))
{
$category = $row['category'];
$query2 = "SELECT * FROM grocery WHERE category='$category' ORDER BY item ASC";
$result2 = mysqli_query($dbc, $query2)
or die("Error Querying Database");
echo '<tr>';
echo '<td class="catHead" colspan=11>'.$category.'</td>';
echo '</tr>';
$catCount=1;
while($inRow = mysqli_fetch_array($result2))
{
$id = $inRow['id'];
$shop = $inRow['shop'];
$item = $inRow['item'];
$qnty = $inRow['quantity'];
$unit = $inRow['unit'];
$price_based_on = $inRow['price_based_on'];
$mrp = $inRow['MRP'];
$sellers_price = $inRow['sellers_price'];
$last_updated_on = $inRow['last_updated_on'];
echo '<tr>';
echo '<td><input type="checkbox" id="selected" value="' . $id . '" name="selected[]" /></td>';
echo '<td>'.$id.'</td>';
echo '<td>'.$catCount.'</td>';
echo '<td>'.$shop.'</td>';
echo '<td class="leftAligned">'.$item.'</td>';
echo '<td>'.$qnty.'</td>';
echo '<td>'.$unit.'</td>';
echo '<td>'.$price_based_on.'</td>';
echo '<td class="pri">₹'.$mrp.'</td>';
echo '<td class="pri">₹'.$sellers_price.'</td>';
echo '<td>'.$last_updated_on.'</td>';
echo '</tr>';
$catCount++;
}
}
?>
</table>
</div>
</form>
<div class="dialogBG">
<div id="addItemContainer" class="dialog">
<div class="closeDialog"></div>
<h1>Edit Item</h1>
<form id="data" method="post" action="<?php $_SERVER['PHP_SELF']; ?>">
<?php
if(isset($_POST['action']))
{
if($_POST['action']=='edit')
{
echo '<script>flag=1;</script>';
foreach ($_POST['selected'] as $edit_id)
{
$query = "SELECT * FROM grocery WHERE id = $edit_id";
$result = mysqli_query($dbc, $query)
or die('Error querying database.');
break;
}
$inRow = mysqli_fetch_array($result);
$id = $inRow['id'];
$shop = $inRow['shop'];
$category = $inRow['category'];
$item = $inRow['item'];
$qnty = $inRow['quantity'];
$unit = $inRow['unit'];
$price_based_on = $inRow['price_based_on'];
$mrp = $inRow['MRP'];
$sellers_price = $inRow['sellers_price'];
$last_updated_on = $inRow['last_updated_on'];
}
}
?>
<div class="leftAligned">
<label for="id">ID : </label>
<input type="text" id="id" name="id" value="<?php echo $id; ?>" required>
<div class="inp">
<label for="id_disp">ID : </label>
<input type="text" id="id_disp" name="id_disp" value="<?php echo $id; ?>" required disabled>
</div> <br>
<div class="inp">
<label for="shop">Shop : </label>
<input type="text" id="shop" name="shop" value="<?php echo $shop; ?>" required>
</div> <br>
<div class="inp">
<label for="category">Category : </label>
<input type="text" id="category" name="category" value="<?php echo $category; ?>" required>
</div> <br>
<div class="inp">
<label for="item">Item : </label>
<input type="text" id="item" name="item" value="<?php echo $item; ?>" required>
</div> <br>
<div class="inp">
<label for="qnty">Quantity : </label>
<input type="text" id="qnty" name="qnty" value="<?php echo $qnty; ?>" required>
</div> <br>
<div class="inp">
<label for="unit">Unit : </label>
<input type="text" id="unit" name="unit" value="<?php echo $unit; ?>" required>
</div> <br>
<div class="inp">
<label for="price_based_on">Price based on : </label>
<select name="price_based_on" id="price_based_on">
<option value="kilos">Kilos</option>
<option value="packet">Packet</option>
<option value="bottle">Bottle</option>
<option value="box">Box</option>
<option value="piece">Piece</option>
</select>
</div> <br>
<div class="inp">
<label for="mrp">MRP (₹) : </label>
<input type="text" id="mrp" name="mrp" value="<?php echo $mrp; ?>" required>
</div> <br>
<div class="inp">
<label for="sellers_price">Seller's Price (₹) : </label>
<input type="text" id="sellers_price" value="<?php echo $sellers_price; ?>" name="sellers_price" required>
</div> <br>
<div class="inp">
<label for="last_updated_on">Last Updated on : </label>
<input type="date" id="last_updated_on" name="last_updated_on" value="<?php echo $last_updated_on; ?>" required>
</div>
</div>
<div class="inp">
<input id="insertButton" type="submit" name="insertButton" value="Insert">
</div>
</form>
<div id="message">
<?php
if(isset($_POST['insertButton']))
{
$id = $_POST['id'];
$shop = $_POST['shop'];
$category = $_POST['category'];
$item = $_POST['item'];
$qnty = $_POST['qnty'];
$unit = $_POST['unit'];
$price_based_on = $_POST['price_based_on'];
$mrp = $_POST['mrp'];
$sellers_price = $_POST['sellers_price'];
$last_updated_on = $_POST['last_updated_on'];
$result=null;
foreach ($_POST as $key => $value)
{
echo "<script> alert('$key contains $value'); </script>";
}
$query = "UPDATE grocery SET shop='$shop', category='$category', item='$item', quantity='$qnty', unit='$unit', price_based_on='$price_based_on', mrp='$mrp', sellers_price='$sellers_price', last_updated_on='$last_updated_on' WHERE id=$id";
if(!empty($shop)&&!empty($category)&&!empty($item)&&is_numeric($qnty)&&!empty($unit)&&is_numeric($mrp)&&is_numeric($sellers_price)&&!empty($last_updated_on))
{
$result = mysqli_query($dbc, $query)
or die(mysqli_error($dbc));
}
if($result)
{
echo '<span class="success">Item Edited Successfully!</span>';
}
else
{
echo '<span class="failure">Failed to insert Item.</span>';
}
//header("Refresh:2");
}
?>
</div>
</div>
</div>
<script type="text/javascript">
$(document).ready(function(){
$('.button').click(function(event){
if($(this).val()=="Delete")
{
$("#deleteConfirmDialog").show(200).parent(".dialogBG").fadeIn(200);
$("#action").val('confirmDelete');
}
else if($(this).val()=="Edit")
{
event.preventDefault();
$("#action").val('edit');
$("#list").submit();
}
});
if(flag===1)
{
console.log("This shouldn't be there if the page reloads!");
$("#addItemContainer").show(200).parent(".dialogBG").fadeIn(200);
}
$(".closeDialog").click(function (e){
$(this).parent(".dialog").hide('200').parent(".dialogBG").fadeOut('200');
});
$(".cancelButton").click(function (e){
$(this).parent(".dialog").hide('200').parent(".dialogBG").fadeOut('200');
});
$("#insertButton").click(function(event) {
$("#id").attr('disabled', 'false');
});
});
</script>
<?php
echo "<pre>" . var_dump($_POST) . "</pre>";
mysqli_close($dbc);
?>
</body>
</html>
接下来，我使用：
警告$ _POST的内容foreach ($_POST as $key => $value)
{
echo "<script> alert('$key contains $value'); </script>";
}
它显示除id和id_disp以外的所有键值。现在，id_disp被禁用，所以我理解为什么它从$ _POST数组中省略了，但为什么id iteself，一个文本字段被它忽略了？为什么会这样？