PHP 代码不会回显我对象的属性

Question

我正在为 class 做一个实验，在让我的 echo 语句正常运行时遇到了一些麻烦。我正在尝试将一个句子存储在对象内的一个变量中，然后检索并回显该变量的值。

 <?php
class MagicSentence {
    public $sentence;

    public function __construct($sentence) {
        $this->setSentence($sentence);
    }

    public function getSentence() { return $this->$sentence; }
    public function setSentence($sentence) {
        $this->sentence = $sentence;
    }
} // End class MagicSentence

    $magicSentence = new MagicSentence("The cow jumped over the moon.");
?>

<html>
    <head>
        <meta charset="utf-8">
        <title>Pete's Treats Candy Contest</title>
    </head>
    <body>
        <?php 
            //include ('header.php'); 

            echo 'The magic sentence is: ' . $magicSentence->getSentence();
        ?>
    </body>
</html>

Answer 1

应该是：

public function getSentence() { return $this->sentence; }

注意 sentence 上缺少的 $。只是关于 PHP 的事情之一要记住。

PHP 代码不会回显我对象的属性

PHP code will not echo out the attribute of my object

php

getter

setter

class

echo