arrayAccess的接口使用

<?php

    //get the methods instance of ArrayAccess

    //get the properties instance of ArrayAccess

    $reflection = new ReflectionClass('ArrayAccess');

    //var_dump($reflection->getMethods());

    //var_dump($reflection->getProperties());

    

    class dbTypes implements ArrayAccess{

        private $dbtypes = array();

        

        //判定是否存在

        public function offsetExists($offset){

            return isset($this->dbtypes[$offset]) ? true : false;

        }

        //获取一个值

        public function offsetGet($offset){

            if($this->offsetExists($offset)){

                return $this->dbtypes[$offset];

            }else{

                return null;

            }

        }

        //设置一个值

        public function offsetSet($offset,$value){

                $this->dbtypes[$offset] = $value;

        }

        //删除一个值

        public function offsetUnset($offset){

            unset($this->dbtypes[$offset]);

        }

    }

    

    $types = new dbTypes();

    echo $types['nosql'];