PHP explode string into multidimensional array [duplicate]

This question already has an answer here:

• Convert dot syntax like “this.that.other” to multi-dimensional array in PHP 5 answers

I have strings like Foo::Bar::Baz and need to transform them into keys of an multidimensional associative array like this $arr['Foo']['Bar']['Baz'] = 'some value'

The problem is that the number of parts can vary. So I need to find a solution to explode the parts into the keys of an multidimensional array.

My current solution looks like this

    function write($key, $value)
{
    $parts = explode("::", $key);
    if (count($parts) == 1) {
        $this->body[$parts[0]] = $value;
    } elseif (count($parts) == 2) {
        $this->body[$parts[0]][$parts[1]] = $value;
    } elseif (count($parts) == 3) {
        $this->body[$parts[0]][$parts[1]][$parts[2]] = $value;
    }
}

It works but is very redundant and it only supports three parts.

Is there a way to automatically explode the parts into the keys of an array?