PHP中的getter和setter方法是什么？

In this article, we learn the best way to create getter and setter strategies in PHP. Getter and setter strategies are utilized when we need to restrict the direct access to the variables by end-users. Getters and setters are methods used to define or retrieve the values of variables, normally private ones.

Just as the name suggests, a getter method is a technique that gets or recovers the value of an object. Also, a setter method is a technique that sets the value of an object.

Let's understand the use of getter and setter methods through an example.

<?php
   class Person{
      private $name;
      public function setName($name){
         $this->name = $name;
      }
      public function getName(){
         return $this->name;
      }
   }
   $person = new Person();
   echo $person->name;
?>

PHP Error Cannot access private property Person::$name

In our Person class above, we have a private property called $name. Because it is private property, we are unable to access them directly like the above and that will produce a fatal error.

To run the code above and get our desired output Let's test this example.

<?php
   class Person{
      private $name;
      public function setName($name){
         $this->name = $name;
      }
      public function getName(){
         return 'welocme'. $this->name;
      }
   }
   $person = new Person();
   $person->setName('Alex');
   $name = $person->getName();
   echo $name;
?>

welcomeAlex

在这里，为了访问我们的私有属性，我们创建了一个名为getData的“getter”函数，因为属性的可见性设置为私有，您也无法更改或修改它们的值。因此，您应该使用我们创建的“setter”函数之一：setName。之后，我们实例化了Person对象。

我们使用我们的setter技术setData将$name属性设置为“Alex”。然后，我们使用我们的getter函数getData检索了$name属性的值。