Why is the php so messed up? why doesn't it make sense compared to python and js ?

void preOrder(Node *root) {

            if (root == nullptr){
            return;
    }

    std::cout << root->data << " ";
    preOrder(root->left);
    preOrder(root->right);}

}

Why is the C++ 14 solution template formulated in such a weird way that you cannot include additional libraries (such as stack for this question)? The C++ 11 and 20 templates are totally fine. I wish the solution templates are all standardized like Leetcode does.

Python solution:

def preOrder(root):
    def recursion(root, results):
        if root is None:    # base case: empty subtree
            return
        results.append(root.info)
        recursion(root.left, results)
        recursion(root.right, results)        
    results = []
    recursion(root, results)
    print(" ".join(map(str, results)))