PHP data structure: XML data parsing, exploring the charm of structured data

How to parse XML data in PHP? Use the DOMDocument class to load the XML document and then parse the data using methods such as getElementsByTagName(), getAttribute(), and nodeValue.

PHP data structure: XML data parsing, explore the charm of structured data

XML (Extensible Markup Language) is an A popular data format widely used to store and exchange structured data. Parsing XML data using PHP makes it easy to extract valuable information from other applications or websites. This article will explore how to parse XML data in PHP and provide a practical case to illustrate.

Loading XML documents

To parse XML documents, you need to use the DOMDocument class. The following code demonstrates how to load a local XML file:

$doc = new DOMDocument();
$doc->load('data.xml');

Parsing XML data

After the document is loaded, various methods can be used to parse the data. Some commonly used methods include:

• getElementsByTagName(): Gets all element nodes with the specified tag name.
• getAttribute(): Get the specific attribute value of a specific element.
• nodeValue: Get the value of the text node.

The following code example demonstrates how to obtain the attribute value named "name":

$elements = $doc->getElementsByTagName('person');
foreach ($elements as $element) {
    echo $element->getAttribute('name') . PHP_EOL;
}

Practical case

To illustrate how to use PHP parses XML data, let's create a simple script to parse an XML file of bank account data:

$doc = new DOMDocument();
$doc->load('accounts.xml');

$accounts = [];

// 获取所有账户元素
$elements = $doc->getElementsByTagName('account');

// 循环遍历所有账户
foreach ($elements as $element) {
    // 创建一个新的帐户数组
    $account = [];

    // 获取账户编号
    $account['number'] = $element->getAttribute('number');

    // 获取账户余额
    $elements = $element->getElementsByTagName('balance');
    $account['balance'] = $elements->item(0)->nodeValue;

    // 添加账户到数组
    $accounts[] = $account;
}

// 打印账户信息
print_r($accounts);

After running this script, it will parse the XML file and print information about all accounts and their balances.

By using the DOMDocument class, we can easily parse XML data from various sources. Mastery of XML data parsing techniques is critical for data exchange and application integration.

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