How to convert a PHP array to XML?

To convert an array to XML in PHP, you can use the SimpleXMLElement class.

Here’s an example of how to convert an array to an XML string:

$array = [
    'item' => [
        [
            'name' => 'apple',
            'price' => 0.5,
        ],
        [
            'name' => 'banana',
            'price' => 0.25,
        ],
    ],
];

$xml = new SimpleXMLElement('<root/>');
array_walk_recursive($array, array ($xml, 'addChild'));
$xml_string = $xml->asXML();

// $xml_string is now:
// '<root><item><name>apple</name><price>0.5</price></item><item><name>banana</name><price>0.25</price></item></root>'

You can also use the array_to_xml function from this library: https://github.com/spatie/array-to-xml

Here’s an example of how to use the array_to_xml function:

$array = [
    'item' => [
        [
            'name' => 'apple',
            'price' => 0.5,
        ],
        [
            'name' => 'banana',
            'price' => 0.25,
        ],
    ],
];

$xml = array_to_xml($array);
$xml_string = $xml->asXML();

// $xml_string is now:
// '<root><item><name>apple</name><price>0.5</price></item><item><name>banana</name><price>0.25</price></item></root>'

You can then use the $xml_string variable to save the XML string to a file, or send it as an HTTP response, or do any other operation you need.

For example, to save the XML string to a file, you can use the file_put_contents function:

$filename = 'items.xml';
file_put_contents($filename, $xml_string);

To send the XML string as an HTTP response, you can use the header function and the echo statement:

header('Content-Type: application/xml');
echo $xml_string;
exit;

Note that the SimpleXMLElement class and the array_to_xml function only support a limited subset of the XML specification. If you need to generate more complex or custom XML documents, you can use a different library such as DOM or XMLWriter.