How can recursive patterns be used in PHP to handle nested structures like in the provided example?

Recursive patterns can be used in PHP to handle nested structures by creating a function that calls itself to iterate through each level of the nested structure. This allows for processing of nested arrays or objects without needing to know the depth of the structure beforehand.

function processNestedStructure($data) {
    foreach ($data as $key => $value) {
        if (is_array($value) || is_object($value)) {
            processNestedStructure($value);
        } else {
            // do something with the value
            echo $value . "\n";
        }
    }
}

// Example usage
$data = [
    'key1' => 'value1',
    'key2' => [
        'subkey1' => 'subvalue1',
        'subkey2' => [
            'subsubkey1' => 'subsubvalue1'
        ]
    ]
];

processNestedStructure($data);