PHP面向对象访问修饰符介绍
它们可以分别用在类的属性和方法上(类的属性和方法统称为类的成员)，用来修饰类成员的访问权限
PHP中有三种访问修饰符，分别是：
public（公共的、默认）
protected（受保护的）
private（私有的）
它们可以分别用在类的属性和方法上(类的属性和方法统称为类的成员)，用来修饰类成员的访问权限。
public（公共的、默认）
在PHP5中如果类没有指定成员的访问修饰符，默认就是public的访问权限。
/*
以下两个方法声明访问权限效果相同
*/
function say(){};
publilc function say(){};
当类的成员被声明为public的访问修饰符时，该成员能被外部代码访问和操作。
private（私有的）
被定义为private的成员，对于类内部所有成员都可见，没有访问限制。对类外部不允许访问。
protected（受保护的）
protected稍微有点复杂，被声明为protected的成员，只允许该类的子类进行访问。
访问权限情况表：
访问权限
public
protected
private
所有
★
子类
★
★
类内
★
★
★
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1378
52
iOS 17: How to control which apps can access your photos
Sep 13, 2023 pm 09:09 PM
In iOS17, Apple has more control over what apps can see in photos. Read on to learn how to manage app access by app. In iOS, Apple's in-app photo picker lets you share specific photos with the app, while the rest of your photo library remains private. Apps must request access to your entire photo library, and you can choose to grant the following access to apps: Restricted Access – Apps can only see images that you can select, which you can do at any time in the app or by going to Settings > ;Privacy & Security>Photos to view selected images. Full access – App can view photos
How to access JSONNode's JSON fields, arrays and nested objects in Java?
Aug 30, 2023 pm 11:05 PM
A JsonNode is Jackson's JSON tree model that can read JSON into JsonNode instances and write JsonNode into JSON. We can use Jackson to read JSON into a JsonNode by creating an ObjectMapper instance and calling the readValue() method. We can access fields, arrays or nested objects using the get() method of the JsonNode class. We can use the asText() method to return a valid string representation and convert the node's value to Javaint using the asInt() method of the JsonNode class. In the example below we can access Json
Access metadata of various audio and video files using Python
Sep 05, 2023 am 11:41 AM
We can access the metadata of audio files using Mutagen and the eyeD3 module in Python. For video metadata we can use movies and the OpenCV library in Python. Metadata is data that provides information about other data, such as audio and video data. Metadata for audio and video files includes file format, file resolution, file size, duration, bitrate, etc. By accessing this metadata, we can manage media more efficiently and analyze the metadata to obtain some useful information. In this article, we will take a look at some of the libraries or modules provided by Python for accessing metadata of audio and video files. Access audio metadata Some libraries for accessing audio file metadata are - using mutagenesis
How to solve the problem of inaccessibility after Tomcat deploys war package
Jan 13, 2024 pm 12:07 PM
How to solve the problem that Tomcat cannot successfully access the war package after deploying it requires specific code examples. As a widely used Java Web server, Tomcat allows developers to package their own developed Web applications into war files for deployment. However, sometimes we may encounter the problem of being unable to successfully access the war package after deploying it. This may be caused by incorrect configuration or other reasons. In this article, we'll provide some concrete code examples that address this dilemma. 1. Check Tomcat service
What are the java access control modifiers?
Sep 20, 2023 pm 02:43 PM
There are four types of java access control modifiers, namely public, protected, private, and default access modifiers. Detailed introduction: 1. Public, public is the loosest access control modifier. Modified classes, methods and variables can be accessed by any other class. When a class, method or variable is declared as public, they can be accessed anywhere be accessed, whether it is a class in the same package or a class in a different package; 2. protected modifier, etc.
How to solve external resource access and calls in PHP development
Oct 08, 2023 am 11:01 AM
How to solve the problem of accessing and calling external resources in PHP development requires specific code examples. In PHP development, we often encounter situations where we need to access and call external resources, such as API interfaces, third-party libraries or other server resources. When dealing with these external resources, we need to consider how to access and call safely while ensuring performance and reliability. This article describes several common solutions and provides corresponding code examples. 1. Use the curl library to call external resources. Curl is a very powerful open source library.
How to solve the problem of access denied when modifying files in Windows 7
Jul 04, 2023 pm 07:01 PM
How to solve the problem of access denied when modifying files in win7? When modifying some system files, we will often be prompted that we do not have permission to perform the operation. We can turn off the folder permissions or obtain administrator rights. For users who need to modify such files, let’s take a look at the following specific tutorials. Solution to the problem of access denied when modifying files in win7: 1. First select the corresponding folder, click the tool above, and select the folder option. 2. Enter the View tab. 3. Uncheck Use Simple File Sharing and confirm. 4. Then right-click the corresponding folder and click Properties. 5. Enter the Security tab. 6. Select the icon position and click Advanced. 7
What to do if shared folders cannot be accessed in Windows 10 Home Edition
Jan 11, 2024 pm 07:36 PM
Sharing folders is indeed an extremely useful feature in a home or business network environment. It allows you to easily share folders with other users, thereby facilitating file transfer and sharing. Win10 Home Edition shared folder cannot be accessed Solution: Solution 1: Check network connection and user permissions When trying to use Win10 shared folders, we first need to confirm whether the network connection and user permissions are normal. If there is a problem with the network connection or the user does not have permission to access the shared folder, it may result in inaccessibility. 1. First, please ensure that the network connection is smooth so that the computer and the computer where the shared folder is located are in the same LAN and can communicate normally. 2. Secondly check the user permissions to confirm that the current user has permission to share files.
