Apachemysql安装
由于工作需要,这几天一直在研究Linux Apache Php Mysql的安装.最初,在google上搜了下"Linux myqsl apache php",搜出来N多记录安装的文章,从里边挑了几篇试试着装,均义失败告终.具郁闷.网上的文章都是抄来抄去,实在意义不大.后来偶去php的官方网站www.php.net,找到PHP Manual,依据上面的步骤,安装成功.教训:尽量从本源处去寻求解决问题的方法,如官方网站,程序自带的README,INSTALL文档.
抓住本质,寻求计算机科学的精髓.
下面将我的安装步骤写下来
环境: Redhat FedoraCore3
Apache_1.3.34 PHP-4.0.2
几点说明: 本步骤不保证其他版本能安装成功,对于Apache-2有些不同,详见www.php.net
本步骤采用的是把PHP以DSO的方式安装到Apache中,静态方式安装略有不同
步骤:
tar -zxvf Apache_1.3.34.tar.gz
cd Apache_1.3.34
./configure --prefix=/usr/local/apache --enable-module=so
make
make install
tar -zxvf php-4.0.2.tar.gz
cd php-4.0.2
./configure --with-apxs=/usr/local/apache/bin/apxs
make
make install
cd Apache_1.3.34
cp php.ini-dist /usr/local/lib
修改Apache的配置文件httpd.conf,添加
AddType application/x-httpd-php .php
重起Apache服务器
编写测试文档info.php

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.

Key players in HTTP cache headers include Cache-Control, ETag, and Last-Modified. 1.Cache-Control is used to control caching policies. Example: Cache-Control:max-age=3600,public. 2. ETag verifies resource changes through unique identifiers, example: ETag: "686897696a7c876b7e". 3.Last-Modified indicates the resource's last modification time, example: Last-Modified:Wed,21Oct201507:28:00GMT.

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

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.


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