php set get method call

The set and get methods in PHP are a common way to access private properties in object-oriented programming. The set method is used to set the value of a private property, while the get method is used to obtain the value of a private property. This article will introduce how to write set and get methods in PHP and demonstrate how to call these methods.

1. What are the set and get methods

The set and get methods are commonly used ways to access private properties in PHP. Private attributes are attributes defined in a class that can only be accessed by methods of the class and cannot be directly accessed or modified by external programs. This is a protection mechanism that makes the implementation details of a class invisible to the outside world and can only be accessed and modified through public methods defined within the class.

The set and get methods are usually used to set and get the value of private properties. The set method is used to set the value of a private property, usually with one parameter, the property value to be set, and does not return any value. The get method is used to obtain the value of a private property without parameters, but will return the value of the private property.

2. How to write set and get methods

In PHP, writing set and get methods is very simple. Normally, we need to define private properties in the class and write corresponding set and get methods in the class. The following example code shows how to write a class that contains private properties and corresponding set and get methods:

class Person {
    private $name;

    // set方法
    public function setName($name) {
        $this->name = $name;
    }

    // get方法
    public function getName() {
        return $this->name;
    }
}

In this example, we define a Person class and define a private property $name. We also wrote two methods: the setName method is used to set the value of $name, and the getName method is used to obtain the value of $name.

In the setName method, we use the $this keyword to refer to the current object (the $this keyword in PHP refers to referencing the current object, similar to this in Java or self in C). We can access the private properties of this class through the $this keyword.

In the getName method, we only need to return the value of $name. We do not use the $this keyword here because the $get method does not need to modify the private properties of the class.

3. How to call the set and get methods

In PHP, we can call the methods defined in the class by instantiating the object. The following is a sample code that calls the set and get methods in the Person class:

// 实例化Person类
$person = new Person();

// 调用setName方法设置$name的值
$person->setName('张三');

// 调用getName方法获取$name的值
echo $person->getName();

In this example, we first instantiate the Person class and assign it to the $person variable. Next, we called the setName method of the $person object and set the value of $name to "Zhang San". Finally, we use the echo statement to output the result returned by the getName method of the $person object.

In PHP, we can call methods in a class through $object name->method name. When we call a method on an object, PHP will automatically pass the reference of the current object to the method. We do not need to explicitly pass the object reference when calling the method.

4. Conclusion

The set and get methods are common ways to access private properties in PHP object-oriented programming. Normally, we can define private properties in the class and write corresponding set and get methods to access and modify the private properties.

In PHP, we can call methods defined in a class by instantiating objects. When we call a method on an object, PHP will automatically pass the reference of the current object to the method. We do not need to explicitly pass the object reference when calling the method.

When writing classes, remember good encapsulation principles: encapsulate implementation details inside the class and provide a public interface for interacting with other parts of the code. In this way, we can maintain the code more easily and better protect the security of the related code.

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