PHP -使用递归将“checked”连接到多维数组中的每个字符串值

function addCheckedRecursive(&$array) {
    foreach ($array as &$value) {
        if (is_array($value)) {
            addCheckedRecursive($value);
        } else if (is_string($value)) {
            $value .= " checked";
        }
    }
}

$data = [
    "value1",
    "value2",
    [
        "value3",
        [
            "value4",
            "value5"
        ]
    ]
];

addCheckedRecursive($data);

print_r($data);