把一个PHP对象当成数组来访问

PHP预定义接口之 ArrayAccess(数组访问式)

一个实现了这个接口的类就可以做到了

class FacadeCompany implements ArrayAccess
{
   private  $data;

    /**
     * Whether a offset exists
     * @link https://php.net/manual/en/arrayaccess.offsetexists.php
     * @param mixed $offset <p>
     * An offset to check for.
     * </p>
     * @return boolean true on success or false on failure.
     * </p>
     * <p>
     * The return value will be casted to boolean if non-boolean was returned.
     * @since 5.0.0
     */
    public function offsetExists($offset)
    {
        // TODO: Implement offsetExists() method.
        return isset($this->data[$offset]);
    }

    /**
     * Offset to retrieve
     * @link https://php.net/manual/en/arrayaccess.offsetget.php
     * @param mixed $offset <p>
     * The offset to retrieve.
     * </p>
     * @return mixed Can return all value types.
     * @since 5.0.0
     */
    public function offsetGet($offset)
    {
        // TODO: Implement offsetGet() method.
        return $this->data[$offset];
    }

    /**
     * Offset to set
     * @link https://php.net/manual/en/arrayaccess.offsetset.php
     * @param mixed $offset <p>
     * The offset to assign the value to.
     * </p>
     * @param mixed $value <p>
     * The value to set.
     * </p>
     * @return void
     * @since 5.0.0
     */
    public function offsetSet($offset, $value)
    {
        // TODO: Implement offsetSet() method.
        $this->data[$offset] = $value;
    }

    /**
     * Offset to unset
     * @link https://php.net/manual/en/arrayaccess.offsetunset.php
     * @param mixed $offset <p>
     * The offset to unset.
     * </p>
     * @return void
     * @since 5.0.0
     */
    public function offsetUnset($offset)
    {
        // TODO: Implement offsetUnset() method.
        unset($this->data[$offset]);
    }
}