Map

Map.php

<?php

class Map extends ArrayObject
{
    public function __construct($input = [], $flags = 0, $iterator_class = "ArrayIterator")
    {
        parent::__construct([], $flags, $iterator_class);

        foreach ($input as $k=>$v) {
            $this[$k] = $v;
        }
    }

    public function offSetSet($index, $value)
    {
        if (is_string($index)) {
            $index = trim($index);
        }

        if (!is_numeric($index) && empty($index)) {
            throw new \InvalidArgumentException(sprintf('A map key can\'t be empty [%s]', $index));
        }

        parent::offSetSet($index, $value);
    }

    public function getArrayCopy()
    {
        if (empty((array) $this)) {
            return new \stdClass();
        }

        return parent::getArrayCopy();
    }

    public function append($value)
    {
        throw new \BadMethodCallException("You can't append to a map");
    }

    public function exchangeArray(array $input)
    {
        parent::exchangeArray([]);

        foreach ($input as $k=>$v) {
            $this[$k] = $v;
        }

        return (array) $this;
    }

    public function __get($item)
    {
        return $this->offSetGet($item);
    }

    public function __set($item, $value)
    {
        $this->offSetSet($item, $value);
    }
}