#PHP simple flexible data container with ArrayObject

depot.php

<?php
function depot()
{
    static $container = null;
    if (null === $container) {
        $container = new \ArrayObject(array(), $flag);
    }

    $flag = \ArrayObject::ARRAY_AS_PROPS;
    $args = func_get_args();
    $num = func_num_args();

    if (2 === $num) {
        $value = (is_array($args[1]) ? (object)$args[1] : $args[1]);
        $keys = explode('.', $args[0]);
        $last = count($keys) - 1;
        $cur =& $container;
        foreach($keys as $i => $key) {
            if (empty($key)) {
                continue;
            }

            if ($i !== $last) {
                if (
                    ($cur instanceof \ArrayObject && $cur->offsetExists($key)) ||
                    (is_array($cur) && array_key_exists($key, $cur))
                ) {
                    $cur =& $cur[$key];
                } else {
                    $cur[$key] = new \ArrayObject(array(), $flag);
                    $cur =& $cur[$key];
                }
            } else {
                if (is_array($value) || $value instanceof \stdClass) {
                    $cur[$key] = new \ArrayObject($value, $flag);
                } else {
                    $cur[$key] = $value;
                }
            }
        }
        return $cur;
    }

    elseif (1 === $num) {
        if (!$container->count()) {
            return;
        }

        $keys = explode('.', $args[0]);
        $cur = $container;
        foreach($keys as $key) {
            if (empty($key)) {
                continue;
            }

            if (
                ($cur instanceof \ArrayObject && $cur->offsetExists($key)) ||
                (is_array($cur) && array_key_exists($key, $cur))
            ) {
                $cur = $cur[$key];
            } else {
                return null;
            }
        }
        return $cur;
    }

    else {
        if ($container->count()) {
            return $container;
        }
    }
}

/*

// Set
depot('key', 'val');

// Get
$val = depot('key');

// Set nested
depot('foo.var', 'baz');
// dump
var_dump( depot('foo') );
// result
ArrayObject(
    'var' => 'baz'
)

// Get all
$all = depot();
*/