


Installation of LAMP environment and yaf extension under Ubuntu14, ubuntu14yaf_PHP tutorial
Installation of LAMP environment and yaf extension under Ubuntu14, ubuntu14yaf
I installed the lamp environment under ubuntu some time ago, record the installation process for easy reference later.
InstallationlampEnvironment
① Install apache
<span>sudo</span> apt-get <span>install</span> apache2
The system will pop up a prompt as shown in the picture. At this time, you need to enter the user's password before installation. All other installation operations below require entering the password, which is the same every time.
Open the browser and enter localhost. If the following interface is displayed, the installation is successful.
②Install php
<span>sudo</span> apt-get <span>install</span> php5
③Install mysql
<span>sudo</span> apt-get <span>install</span> mysql-server
At this point the lamp environment installation is completed. Check whether it is correct.
AfterApache is installed , the root directory of is in /var/www/html
cd /var/www/<span>html </span><span>sudo</span> <span>vi</span> phpinfo.php
Enter
<?<span>php </span><span>phpinfo</span><span>(); </span>?>
Then open the browser and enter localhost/phpinfo.php. If the following page appears, the installation is successful.
Install the development package of php
Extensions can only be installed if the development package is installed
<span>sudo</span> apt-get <span>install</span> php5-dev
Install the php extension
a) Install php-mysql
This installation comes with the system library, you can install it directly.
<span>sudo</span> apt-get <span>install</span> php5-mysql
Restart apacheload mysql support
<span>sudo</span> service apache2 restart
b) Install yaf
Before installing yaf, you need to install the pcre library, otherwise install yafAn error will be reported
<span>sudo</span> apt-get <span>install</span> libpcre3 libpcre3-dev
Download the latest yaf file
cd /usr/local/src/ <span>sudo</span> <span>wget</span> https:<span>//</span><span>github.com/laruence/php-yaf/archive/master.zip</span>
- To prevent it from having the same name as the file downloaded later, change the name to distinguish it.
Unzip
<span>sudo</span> <span>unzip</span> yaf.<span>zip</span>
As shown below after decompression
cd php-yaf-<span>master </span><span>sudo</span> /usr/bin/phpize
Configuration
Compile
Compile and install
After completion, the yaf.so file is generated in the following directory
Modify the configuration of php.ini and load yaf
<span>sudo</span> <span>vi</span> php.ini
Change the extension directory to the surviving onesoThe directory where the file is located
New
Restartapache
<span>sudo</span> service apache2 restart
Refresh at this time and find that yaf has been installed correctly
If you need other extensions like yaf installation steps.

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.


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