php - PHP防止创建未在类中定义的属性

Question

<?php
//Simple object to keep track of an Article
class ArchiveArticle
{
    public $timestamp;
    public $filename;
    public $slug;
    public $category;
    public $status;
    public $pubdate;
    public $ranking;
    public $newsgate_state;
    public $newsgate_story_id;
    public $newsgate_budget_id;
    public $newsgate_text_id;
    public $newsgate_profile;
    public $taxonomy;
    public $overline;
    public $net_title;
    public $headline;
    public $teasertitle;
    public $teasersummary;
    public $subhead;
    public $summary;
    public $byline_name;
    public $dateline;
    public $paragraphs = array();
    public $more_infos = array();
    public $shirttail;
    public $images = array();
}

$obj = new ArchiveArticle();
$obj->foo = 'bar'; //How can I stop this?
?>

Answer 1

在您的班级中添加：

public function __get($name) { return NULL; }

public function __set($name, $value) { }

说明：这两种方法将拦截对不存在和/或受保护/私有属性的任何访问，如果它不存在，也会阻止它的创建。

另见http://php.net/manual/en/language.oop5.magic.php

根据@DCoder 的建议，您还可以执行以下操作：

public function __get($name) {
  throw new Exception("Property $name cannot be read");
}

public function __set($name, $value) {
  throw new Exception("Property $name cannot be set");
}