php array conversion xml

PHP is a commonly used server-side programming language that can be used to create dynamic web pages, process form data, etc. In PHP, arrays are a frequently used data type. XML is a structured data format that can be used to exchange data between different computer systems and programming languages. This article explains how to convert an array to XML using PHP.

1. Create Array

Creating an array in PHP is very simple, just use the array() function or the [] symbol. For example, we can create an array containing some product information:

$products = array(
    array(
        'name' => 'Product 1',
        'price' => '10.00'
    ),
    array(
        'name' => 'Product 2',
        'price' => '20.00'
    ),
    array(
        'name' => 'Product 3',
        'price' => '30.00'
    )
);

2. Create XML document

In PHP, we can use the DOMDocument class to create an XML document. We need to create a DOMDocument object first, and then we can add various elements and attributes.

$doc = new DOMDocument('1.0', 'utf-8'); //创建 DOMDocument 对象

$root = $doc->createElement('products'); //创建根元素
$doc->appendChild($root); //将根元素添加到 DOMDocument 对象中

3. Convert Array to XML

Now we are ready to convert the array to XML. We need to loop through each element in the array and create an XML element for each element and add it to the root element.

foreach ($products as $product) {
    $product_element = $doc->createElement('product'); //创建元素
    $root->appendChild($product_element); //添加到根元素中

    $name_element = $doc->createElement('name', $product['name']); //创建子元素并添加文本内容
    $product_element->appendChild($name_element); //添加到 product 元素中

    $price_element = $doc->createElement('price', $product['price']); //创建子元素并添加文本内容
    $product_element->appendChild($price_element); //添加到 product 元素中
}

Now, we have successfully converted the array to XML, and the output of the code is:

<?xml version="1.0" encoding="utf-8"?>
<products>
    <product>
        <name>Product 1</name>
        <price>10.00</price>
    </product>
    <product>
        <name>Product 2</name>
        <price>20.00</price>
    </product>
    <product>
        <name>Product 3</name>
        <price>30.00</price>
    </product>
</products>

4. Save the XML file

We can use DOMDocument The save() method of the class saves the XML document to a file.

$doc->save('products.xml'); //将 XML 文档保存到 products.xml 文件中

5. Conclusion

In this article, we introduced how to use PHP to convert an array to XML, including creating an array, creating an XML document, and converting an array to XML, save XML file and other steps. These techniques can be used extensively to develop web applications and handle data exchange.

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