OOP基础知识-生成随机问答
OOP基础知识-生成随机问答
提问于 2013-07-11 21:50:02
我正在尝试创建一个函数，用于创建一个用于表单验证目的的随机安全问题。不过，我正在苦苦挣扎，因为我似乎无法访问变量的最终值。除了php.net以外的任何帮助都将不胜感激，我一直在那里，但我不是100%理解如何创建我的第一个对象。
class question {
public $sq = '';
public $answer = '';
function generate_question() {
$questions = array( array( question => "What color is the sky?",
answer => "blue"),
array(question => "What month is after April?",
answer => "May"),
array(question => "What animal is usually chasen by a cat?",
answer => "mouse"),
array(question => "What color is banana?",
answer => "yellow"),
array(question => "What is a next day after Monday?",
answer => "Tuesday"),
);
$question = array_rand($questions);
return $sq = $questions[$question]['question'];
return $answer = $questions[$question]['answer'];
}
}
$sqo = new question();
echo $sqo->sq . $sqo->answer;回答 1
Stack Overflow用户
回答已采纳
发布于 2013-07-11 21:52:12
方法只能返回一个值，否则将无法返回另一个值。
更改此代码
$question = array_rand($questions);
return $sq = $questions[$question]['question'];
return $answer = $questions[$question]['answer'];至
$question = array_rand($questions);
return $questions[$question];它会起作用的。
要访问返回数组，请使用
echo $sqo->answer['question'];
echo $sqo->answer['answer'];最好的做法是使用方法来访问类变量。这些变量应该声明为私有，访问它们的方法应该是公共的。此外，您还应该将带有问题和答案的数组声明为私有对象变量。不需要在每次调用方法时都声明它。
我已经将您的类重新设计为更好(不是最好)的解决方案。
class Question
{
private $questions;
public function __construct()
{
$this->questions = array( array( question => "What color is the sky?",
answer => "blue"),
array(question => "What month is after April?",
answer => "May"),
array(question => "What animal is usually chasen by a cat?",
answer => "mouse"),
array(question => "What color is banana?",
answer => "yellow"),
array(question => "What is a next day after Monday?",
answer => "Tuesday")
);
}
public function generate_question()
{
return $this->questions[rand(0, count($this->questions)-1)];
}
}
$sqo = new Question();
$question = $sqo->generate_question();
echo $question['question'];
echo $question['answer'];编辑和工作
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原文链接：
https://stackoverflow.com/questions/17595193
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