PHP XML RSS 错误 xmlParsePI：没有目标名称

Question

请帮忙！遇到此错误： 第 11 行第 3 列的错误：xmlParsePI：没有目标名称。

第 11 行是 atom:link 标记。我尝试将链接更改为实际文件名并得到相同的错误。我在本地运行代码，所以我也尝试使用 localhost url，但仍然是同样的错误。

我是 php 新手，这是我认为是过时材料的 php 课程的作业。任何建议都会有所帮助！

<?php
require_once('./Includes/connectvars.php');
header('Content-type: text/xml');
echo '<?xml version="1.0" encoding="UTF-8"?>';
$builddate = gmdate(DATE_RSS, time());
?>

<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
    <channel>
        <title>Vintage Cars and Trains</title>
        <atom:link href="http://<?= $_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'] ?>" rel="self" type="application/rss+xml" />
        <link>products.php</link>
        <description>Vintage cars and trains for lesson 9</description>
        <lastBuildDate><?php $builddate ?></lastBuildDate>
        <language>en-us</language>

<?

    $query = " SELECT * FROM products WHERE productLine = 'Vintage Cars', 'Trains' ORDER BY dateAdded DESC LIMIT 10 ";
    $result = mysqli_query($dbc, $query)
        or die("Error querying database => $query");

    //Loop through and print data
    while ($newArray = mysqli_fetch_array($result)) {
        $product_code = $newArray[productCode];
        $product_name = $newArray[productName];
        $product_line = $newArray[productLine];
        $product_scale = $newArray[productScale];
        $product_vendor = $newArray['productVendor'];
        $product_description = $newArray['productDescription'];
        $buy_price = $newArray['buyPrice'];

        $pubdate = date(DATE_RSS, strtotime($date_added));
?>

    <item>
        <title><?php echo "$product_code - $product_name"; ?></title>
        <description><?php $description ?></description>
        <link><link>localhost/PHP/Lesson9/products.php?pid=<?php $product_code ?></link>
        <guid isPermaLink="false">localhost/PHP/Lesson9/products.php?pid=<?php $product_code ?><guid>
        <pubDate><?php $pubdate ?></pubDate>
    </item>

    }

    </channel>
</rss>

Answer 1

当你输出一个php变量时，请确保你使用：

<?php echo $variablename; ?>

当你想连接两个 php 变量时，请确保使用句点：

<?php echo $variablename1.' - '.$variablename2; ?>

请记住在每个php内联的末尾回显并加上分号：

<?php echo something; ?>

请记住在循环结束的地方用大括号关闭while循环：

<?php
     while (condition) {
           do something;
     }
?>

这是清理后的代码。

<?php
require_once('./Includes/connectvars.php');
header('Content-type: text/xml');
echo '<?xml version="1.0" encoding="UTF-8"?>';
$builddate = gmdate(DATE_RSS, time());
?>

<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
    <channel>
    <title>Vintage Cars and Trains</title>
    <atom:link href="http://"<?php echo $_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF']; ?>" rel="self" type="application/rss+xml" />
    <link>products.php</link>
    <description>Vintage cars and trains for lesson 9</description>
    <lastBuildDate><?php echo $builddate; ?></lastBuildDate>
    <language>en-us</language>

<?php

$query = " SELECT * FROM products WHERE productLine = 'Vintage Cars', 'Trains' ORDER BY dateAdded DESC LIMIT 10 ";
$result = mysqli_query($dbc, $query)
    or die("Error querying database => $query");

//Loop through and print data
while ($newArray = mysqli_fetch_array($result)) {
    $product_code = $newArray[productCode];
    $product_name = $newArray[productName];
    $product_line = $newArray[productLine];
    $product_scale = $newArray[productScale];
    $product_vendor = $newArray['productVendor'];
    $product_description = $newArray['productDescription'];
    $buy_price = $newArray['buyPrice'];
}

$pubdate = date(DATE_RSS, strtotime($date_added));
?>

<item>
    <title><?php echo $product_code.' - '.$product_name; ?></title>
    <description><?php echo $description; ?></description>
    <link><link>localhost/PHP/Lesson9/products.php?pid=<?php echo $product_code; ?></link>
    <guid isPermaLink="false">localhost/PHP/Lesson9/products.php?pid=<?php echo $product_code; ?><guid>
    <pubDate><?php echo $pubdate; ?></pubDate>
</item>

</channel>
</rss>