Question

大家好！我的问题如下：我正在使用带有产品信息的xml文件。这是 - example.xml

    <?xml version="1.0" encoding="ISO-8859-1"?>
<products>
    <item>
        <name>Flat Screen Television SONY KDL-4500WEED</name>
        <image>http://img.zap.co.il/pics/2/7/9/2/37682972c.gif</image>
        <description>This is our newest TV set from the SONY Comp. and we hope you buy it mothefuckerzzzz....zasdhaskjdhkahdca a dsah dha adlasldoao al ladjjada</description>
        <left>17</left>
    </item>
    <item>
        <name>Aiwa ozvuchitelna sistema</name>
        <image>http://crev.vo.llnwd.net/o42/audioreview/images/products/product_119021.jpg</image>
        <description>This is our newest TV set from the Aiwa Comp. and we hope you buy it mothefuckerzzzz....zasdhaskjdhkahdca a dsah dha adlasldoao al ladjjada</description>
        <left>12</left>
    </item>
    <item>
        <name>Blu-Ray DVD Player Panasonic</name>
        <image>http://news.cnet.com/i/bto/20070725/BD-UP5000_overhead.jpg</image>
        <description>This is our newest TV set from the Aiwa Comp. and we hope you buy it mothefuckerzzzz....zasdhaskjdhkahdca a dsah dha adlasldoao al ladjjada</description>
        <left>33</left>
    </item>
    <item>
        <name>DURO na SHISH...</name>
        <image>http://media.otkrovenia.com/profiles/DureFF.jpg</image>
        <description>This is our newest TV set from the Aiwa Comp. and we hope you buy it mothefuckerzzzz....zasdhaskjdhkahdca a dsah dha adlasldoao al ladjjada</description>
        <left>18</left>
    </item>
</products>

这个想法是用户可以通过php页面保留产品的数量，这将自动告诉他剩下多少产品并更改某些产品的xml文件的值。这是我的php页面 - metro.php：

    <?php
    $products = simplexml_load_file("example.xml");
    $max_per_row = 2;
    $item_count = 0;

echo '<table width="100%" border="0" cellspacing="2" cellpadding="2"><tr>';
    foreach ($products->item as $item)
{
    if ($item_count == $max_per_row)
    {
        echo "</tr><tr>";
        $item_count = 0;
    }
    echo '<form name="reg" action="metro2.php" method="post"><td width="50%"><b>Name:</b>&nbsp;<input name="fname" maxlength="256" value=" ', $item->name , '" readonly style="width: 300px; border:0;" /><br><img src="' , $item->image, '" alt="Product" height="200"><br>' , '<b>Description:</b>&nbsp;',  $item->description , '<br><b>Left:</b>&nbsp;<input name="left" maxlength="7" value="' , $item->left ,'" readonly style="width: 70px; border:0;" /><br>
  <label>
  <input type="submit" name="button" id="button" value="Reserve!" />
  </label>
</form><br><hr /></td>', PHP_EOL;

    $item_count++;
}
   echo '</tr>
</table>';
?>

这是表单操作的PHP页面。这是metro2.php：

 <?php  
$products = simplexml_load_file("example.xml");
$fname = $_POST['fname'];
$left = $_POST['left'];
$new_left = $left - 1;
echo 'You want to reserve&nbsp;<b>', $fname, '</b>.<br />';
echo 'There are now only&nbsp;<b>', $new_left, '</b>&nbsp;of this product.';
$products->item->left = $new_left;
$products->asXML("example.xml");
?>

问题如下。如果我们假设我有33个Aiwas和17个SONY，如果我击中Reserve！对于一个爱华，它给了我在metro2.php 32 Aiwas，保持，但改变了索尼左侧项目的价值，所以当我重新加载页面metro.php它给了我，我有33个Aiwas和32个索尼..它显然没有改变产品正确孩子的价值......我的错误在哪里。我在网站metro2.php的某个地方做客...但我不知道该做什么...请帮助:)提前致谢！

Answer 1

您必须在metro2.php中选择正确的孩子。最好的解决方案是将index opf current child添加为metro.php中的隐藏输入字段。在metro2.php中，您可以获取索引并选择正确的子项来设置新值。

修改

我接受上面的代码并添加更改：

metro.php：

<?php $products = simplexml_load_file("example.xml"); $max_per_row = 2; $item_count = 0; echo '<table width="100%" border="0" cellspacing="2" cellpadding="2"><tr>'; // Change the type of loop for access the items manually and get the correct index. for ($index = 0, $count = $products->count(); $index < $count; $index++) { // Get the item by index $item = $products->children()[$index]; if ($item_count == $max_per_row) { echo "</tr><tr>"; $item_count = 0; } echo '<td width="50%"> <form name="reg" action="metro2.php" method="post"> <b>Name: </b>  <input name="fname" maxlength="256" value=" ', $item->name , '" readonly style="width: 300px; border:0;" /><br> <img src="' . $item->image . '" alt="Product" height="200"><br> <b>Description:</b> ' . $item->description . '<br> <b>Left:</b>   <input type="hidden" name="index" value="' . $index . '" /> <input name="left" maxlength="7" value="' . $item->left . '" readonly style="width: 70px; border:0;" /><br> <label> <input type="submit" name="button" id="button" value="Reserve!" /> </label> </form><br> <hr /> </td>', PHP_EOL; $item_count++; } echo '</tr> </table>'; ?>

metro2.php：

<?php $products = simplexml_load_file("example.xml"); // Get the index of item from post request $index = intval($_POST['index']); $fname = $_POST['fname']; // Parse the left value to in an integer $left = intval($_POST['left']); $new_left = $left - 1; echo 'You want to reserve <b>', $fname, '</b>.<br />'; echo 'There are now only <b>', $new_left, '</b> of this product.'; // Select the correct item which by index and set new value // Use the children method and not the item attribute for select the item, $products->children()[$index]->left = $new_left; $products->asXML("example.xml"); ?>

我还做了一些HTML更改。

编辑＃2：

如果您不理解foreach语句，请正确查看here。

编辑＃3：

更改了循环的类型和对象$products中的项目选择，以便按索引获取项目。

使用PHP更改XML文件的值 - 某个子项

1 个答案: