Question

我无法使用简单的PHP解析器显示XML文件中的数据。我该如何解决？

我找不到这个简单任务的问题而且我完全陷入困境。我正在关注w3schools.com教程，代码不会显示数据。我在我的覆盆子pi上使用了一个apache web服务器。

PHP：

<html>
    <head>
        <style>
            code {
                font-family: ;
            } div {
                margin-top: 5px;
                margin-bottom: 5px;
                margin-left: 5px;
                margin-right: 5px;
                background-color: rgb(177,177,177);
                height: 200px;
                width: 300px;
            }
        </style>
    </head>
    <body>
        <center><h1>Hello BISD! This is a perfectly fine webpage!</h1></center>
        <p>TXT File:</p>
        <div>
        <?php
        $file=fopen("placeholder.txt","r");
        while(!feof($file)) {
            echo fgets($file).'<br>';
        }
        fclose($file);
        ?>
        </div>
        <p>XML File:</p>
        <div>
        <?php
        $XMLFile = simplexml_load_file("test.xml");
        if ($XMLFile === false) {
            echo "Failed loading XML: ";
            foreach(libxml_get_errors() as $error) {
                echo "<br>", $error->message;
            }
        } else {
            foreach($XMLFile->message() as $data) {
                echo $data->subject;
                echo $data->recipient;
                echo $data->sender;
            }
        }
        ?>
        </div>
    </body>
</html>

XML：

<?xml version='1.0' encoding='UTF-8'?>
<message>
    <subject>Test XML File</subject>
    <sender>Harry</sender>
    <recipient>The Internet</recipient>
    <content>Hello world!</content>
</message>
<message>
    <subject>Regarding XML</subject>
    <sender>Harry</sender>
    <recipient>The Internet</recipient>
    <content>XML is awesome!</content>
</message>

页面加载txt文件并显示正确。

Answer 1

刚才说XML必须有1个根元素。而且，当你使用foreach构造时，你试图调用方法message（），而它是一个属性：

foreach($XMLFile->message as $data) {
    echo $data->subject;
    echo $data->recipient;
    echo $data->sender;
}

Answer 2

XML只能有1个根元素。见http://en.wikipedia.org/wiki/Root_element

您需要将XML更改为：

<?xml version='1.0' encoding='UTF-8'?>
<messages>
    <message>
        <subject>Test XML File</subject>
        <sender>Harry</sender>
        <recipient>The Internet</recipient>
        <content>Hello world!</content>
    </message>
    <message>
        <subject>Regarding XML</subject>
        <sender>Harry</sender>
        <recipient>The Internet</recipient>
        <content>XML is awesome!</content>
    </message>
</messages>

PHP简单的XML解析器不返回数据

2 个答案: