doufeng1249 2011-07-28 23:00
浏览 155
已采纳

php静态数组初始化解决方法

I'm not sure what I should be searching to figure out this issue, so I'll show the code and describe the issue:

PHP Code:

<?php
class Foo
{
  private static
    $defaultSettings = array(
      'bar' => new Baz() //error here
    );

  private
    $settings;

  public function __construct( $options = null )
  {
    $this->settings = isset( $options ) ? array_merge( self::$defaultSettings, $options ) : self::$defaultSettings;
  }
}

class Baz
{
  ...code...
}

The Error:

Parse error: syntax error, unexpected T_NEW in [filename] on line [number]

What I'd like to do is have Foo::$defaultSettings contain an instance of an object, but I can't initialize the object when I create the array.

Is there a simpler way around this issue than a static initializer?

Static initializer code for Foo:

//self::init() would be called on the first line of __construct
private static function init()
{
  static $initialized;

  if ( !$initialized )
  {
    $initialized = true;
    self::$defaultSettings['bar'] = new Baz();
  }
}

I feel like there should be a simpler way around this issue than having to run an initializer.


Edit to add:

I could also make the initializer function public and call it immediately after the class definition as Foo::init(); which would reduce the overhead of the __construct function; however, I can't really see a single method call being significant savings.

  • 写回答

1条回答 默认 最新

  • dqp99585 2011-07-28 23:15
    关注

    Class properties cannot evaluate or instantiate anything, unfortunately. The closest you can do is run something from your constructor.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题?

悬赏问题

  • ¥15 想问一下stata17中这段代码哪里有问题呀
  • ¥15 flink cdc无法实时同步mysql数据
  • ¥100 有人会搭建GPT-J-6B框架吗?有偿
  • ¥15 求差集那个函数有问题,有无佬可以解决
  • ¥15 【提问】基于Invest的水源涵养
  • ¥20 微信网友居然可以通过vx号找到我绑的手机号
  • ¥15 寻一个支付宝扫码远程授权登录的软件助手app
  • ¥15 解riccati方程组
  • ¥15 使用rabbitMQ 消息队列作为url源进行多线程爬取时,总有几个url没有处理的问题。
  • ¥15 Ubuntu在安装序列比对软件STAR时出现报错如何解决