Teach you how to play with PHP overview and environment construction

Do you know what PHP is? PHP originated in 1995 and was developed by Rasmus Lerdorf. Up to now, PHP has experienced decades of time washing and has become one of the most popular scripting languages ​​​​in the world. Let's take a look together

PHP5 is a new object-oriented, completely cross-platform Web development language, so it is very practical both from a developer's perspective and from an economic perspective. The PHP language has a simple structure and is easy to get started, and many functions can be implemented with just one function. Many organizations have successively launched new technologies such as IDE tools and Zend search engines for developing PHP.

Overview

What is PHP

PHP (Hypertext Preprocessor, hypertext preprocessor) is a server , cross-platform, HTML-embedded scripting language. Its unique syntax mixes the characteristics of C language, Java language and Perl language. It is a widely used open source multi-purpose scripting language, especially suitable for Web development.
PHP is a B/S (Browser/Server, browser/server) architecture and a three-tier structure. After the server is started, users can access it using only a browser without using client software, which not only maintains the graphical user interface, but also greatly reduces the amount of application maintenance.

Advantages of PHP language

PHP originated from free software and open source code. Using PHP for web application development has the following advantages.

• High security: PHP is open source software. Everyone can see all PHP source code. The way the program code is compiled with Apache makes its security settings more flexible. PHP has recognized security properties.
• Cross-platform features: PHP supports almost all operating system platforms, and supports multiple web servers such as Apache and IIS.
• Supports a wide range of databases: can operate a variety of mainstream and non-mainstream databases, such as MySQL, Access, SQL Server, Oracle, DB2, etc. Among them, PHP and MySQL are currently the best combination. Their combination can Runs cross-platform.
• Easy to learn: PHP is embedded in HTML language, mainly scripting language, with rich built-in functions, simple syntax and easy writing, making it easy for readers to learn and master.
• Fast execution speed: It takes up less system resources and the code execution speed is fast.
• Free: Among the popular enterprise application LAMP platforms, Linux, Apache, MySQL, and PHP are all free software. This open source and free framework can save website operators a lot of money.
• Template: realize the separation of program logic and user interface.
• Supports object-oriented and process: supports both object-oriented and process development styles, and is backward compatible.
• Built-in Zend acceleration engine, stable and fast performance.

New features of PHP5

• Constructor and destructor.
• Reference of object.
• Clone of the object.
• Private, public and protected modes in objects.
• interface.
• Abstract class.
• __call.
• __set and __get.
• Static members.

Using the AppServ combination package under Windows

The combination package is to package Apache, PHP, MySQL and other server software and tools after installation. Developers only need to unzip the configured package to the local hard disk and use it without further configuration. The combination package enables the rapid establishment of a PHP development environment. For programmers who have just started learning PHP, it is recommended to use this method to build a PHP development environment. Although the combination package is much less flexible, it is easy to install, fast and stable, so it is more suitable for beginners.
There are many popular combination packages on the Internet. Here are three recommended combination packages: EasyPHP, AppServ and XAMPP. For novices, it is recommended to use EasyPHP or AppServ, while XAMPP is more complicated.

Click to download the AppServ combination package:

As shown below:

AppSer integrated installation package construction

1. Double-click the AppServ file to open the startup page as shown below:

2. Click the Next button to open the AppServ installation agreement page as shown below:

3. Click the I Agree button to open the page as shown below. On this page, you can set the installation path of AppServ (the default installation path is generally c:\AppServ). After the AppServ installation is completed, Apache, MySQL, and PHP will be stored in this directory in the form of subdirectories:

4. Click the Next button to open the page as shown below, where you can select the programs and components to be installed (all selected by default):

5. Click the Next button to open the page as shown below. This page mainly sets the Apache port number:

The Apache port number is set to Important, it is directly related to whether the Apache server can start successfully. If port 80 on this machine is occupied by IIS or Thunder, then the server configuration cannot be completed if port 80 is still used here. This problem can be solved by modifying the port number here, or modifying the port number of IIS or Thunder.

#6. Click the Next button to open as shown in the figure below. This page mainly sets the login password and character set of the root user of the MySQL database. Here Set the character set to "GB2312 Simplified Chinese", which means that the character set of the MySQL database will be in Simplified Chinese form:

7. Click the Install button to start the installation, as shown below :

8. The following picture shows the interface after the installation is completed:

After installing AppServ, the entire directory will be installed by default. Under the "c:AppServ" path, this directory contains several subdirectories:

Open the browser and enter "http://localhost/[you set The port number, if it is 80, you don’t need to fill it in]". If you open the following picture, it means that the AppServ installation is successful:

Related learning video sharing: php video tutorial

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