PHP基础之预定义接口4——ArrayAccess接口

ArrayAccess {
    /* 方法 */
    abstract public boolean offsetExists ( mixed $offset )
    abstract public mixed offsetGet ( mixed $offset )
    abstract public void offsetSet ( mixed $offset , mixed $value )
    abstract public void offsetUnset ( mixed $offset )
}

<?php
    class obj implements ArrayAccess {
        private $container = array();
        public function __construct() {
            $this->container = array(
                "one" => 1,
                "two" => 2,
                "three" => 3,
            );
        }
        public function offsetSet($offset, $value) {
            if (is_null($offset)) {
                $this->container[] = $value;
            } else {
                $this->container[$offset] = $value;
            }
        }
        public function offsetExists($offset) {
            return isset($this->container[$offset]);
        }
        public function offsetUnset($offset) {
            unset($this->container[$offset]);
        }
        public function offsetGet($offset) {
            return isset($this->container[$offset]) ? $this->container[$offset] : null;
        }
    }

    $obj = new obj;

    var_dump(isset($obj["two"]));
    var_dump($obj["two"]);
    unset($obj["two"]);
    var_dump(isset($obj["two"]));
    $obj["two"] = "A value";
    var_dump($obj["two"]);
    $obj[] = 'Append 1';
    $obj[] = 'Append 2';
    $obj[] = 'Append 3';
    print_r($obj);
?>

以上例程的输出类似于：