我是PHP的新手并编写了这段代码,其中包括一个类和两个实例。该类包含一个setter和getter方法,用于访问私有title
属性,以便在所有标题词由ucwords()
函数大写时显示每个实例。它还包含该上下文中的“authors”属性。
当我执行代码时,我得不到任何东西(既没有title
也没有author
),也没有任何错误,所以我不知道我做错了什么(我在团队中学习时将其作为个人练习的一部分.COM)。
class Recipe {
private $title;
public $author = "Me myself";
public function setTitle($title) {
echo $this->title = ucwords($title);
}
public function getTitle($title) {
echo $this->title;
}
}
$recipe1 = new Recipe();
$recipe1->getTitle("chinese tofu noodles");
$recipe1->author;
$recipe2 = new Recipe();
$recipe2->getTitle("japanese foto maki");
$recipe2->author = "A.B";
注意:来自teamtreehous.com视频的AFAIU,如果我们想要访问私有财产,则需要setter-getter功能。
为什么没有印刷?
<?php
class Recipe {
private $title;
public $author = "Me myself";
/* Private function for set title */
private function setTitle($title) {
echo $this->title = ucwords($title);
}
/* public function for get title */
public function getTitle($title) {
$this->setTitle($title);
}
}
$recipe = new Recipe(); // creating object
$recipe->getTitle("chinese tofu noodles"); // calling function
echo "<br>";
echo $recipe->author;
?>
你混淆了吸气剂,二传手和echo
。 Getters不应该接受参数并返回属性。 Setters接受参数和设置属性。 echo
将(文本)字符串输出到屏幕。
echo的文档。
class Recipe {
private $title;
public $author = "Me myself";
public function setTitle($title) {
$this->title = ucwords($title);
}
public function getTitle() {
return $this->title;
}
}
$noodles = new Recipe();
$noodles->setTitle("chinese tofu noodles");
echo ($noodles->getTitle);
//outputs 'chinese tofu noodles'
你永远不会设置对象的标题。您已经使用了get函数,在这种情况下只打印出任何内容。
调整
<?php
$recipe1 = new Recipe();
//set the title
$recipe1->setTitle("chinese tofu noodles");
//get the title
$recipe1->getTitle();
在您的方案中,您不需要get函数的参数。
在您的两个食谱示例中,您从未设置标题,因为您正在调用getTitle。此外,getTitle不需要参数,因为您不在函数中使用它。
对于作者,您根本不打印任何内容。
这段代码应该有效:
class Recipe {
private $title;
public $author = "Me myself";
public $ingredients = array();
public $instructions = array();
public $tag = array();
public function setTitle($title) {
echo $this->title = ucwords($title);
echo $this->author;
}
public function getTitle() { // Removing parameter as it's unused
echo $this->title;
}
}
$recipe1 = new Recipe();
$recipe1->setTitle("chinese tofu noodles"); // set the title
$recipe1->getTitle(); // print the title
echo $recipe1->author; // Will print "Me myself"
$recipe2 = new Recipe();
$recipe2->setTitle("japanese foto maki"); // set the title
$recipe2->getTitle(); // print the title
echo $recipe2->author = "A.B"; // Will print "A.B"