PHP installation guide linux five_PHP tutorial
The installation method of PM package is created by REDHAT company. This installation method makes it extremely easy to install applications. Now many LINUX distribution companies have also added RPM installation methods to their products, so that the installation of RPM packages has become a standard for LINUX program installation.
Before installing the RPM package, we need to be familiar with some of the command forms and parameters of RPM. In the LINUX text interface, enter the following command:
rpm -help
You can see that there are many parameters. Use the following command to display the HELP file in split screen:
rpm -help |more
Among the many parameters of RPM, the most common ones are -e, -ivh, and -ql.
These three commands are to delete installed RPM packages, install RPM packages, and query installed RPM packages. After understanding the use of these three commands, we can install the program.
First, we need to find the installation file, which is the RPM package to be installed. This package can be obtained from many FTP sites, and these RPM packages can also be found in LINUX versions distributed by many companies. Remember, you must ensure your ROOT status before installation. Only the ROOT identity can load hardware, install programs, and other operations. Let's take installing the php-3.0.7.i386.rpm package as an example to explain how to install it. In the command line, type the following command to start the PHP installation:
rpm -ivh php-3.0.7.i386.rpm
You will see a progress bar, which is used to indicate the progress of the installation. When the progress bar reaches the end, php-3.0.7.i386.rpm is installed.
In this RPM package of PHP, because it supports relatively few options, it generally cannot meet our requirements. Then we can also customize and compile PHP (only suitable for users using REDHAT6.1).
The specific steps are as follows:
First obtain the PHP source code package, unzip it and enter the package.
Modify the apxs file in the /usr/sbin/ directory. Change:
my $CFG_LIBEXECDIR =modules; #substituted via APACI install
to:
my $CFG_LIBEXECDIR =/usr/lib/apache; #substituted via APACI install
Check freetype- Whether the devel package is installed? If not, please install it according to the following command:
rpm -I freetype-devel-1.3.6.i386.rpm
Start the configuration. This step can be done by referring to the previously compiled options. The following options are recommended:
./configure--with-apxs=/usr/sbin/apxs--with-mysql--with-ldap--with-config-file-path=/etc/httpd/conf
Then, use the following commands to compile and install the new PHP.
Make
Make install
Copy the php3.ini-dist file in the source file directory to the /etc/httpd/conf directory and rename it to php3.ini. Use the following command to restart the APACHE service.
/etc/rc.d/init.d/httpb tart
At this time, the new PHP version will take effect.

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.


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