18 Days Practice
Concept of PHP
The PHP acronym originally stood for Personal Pages. But now it’s an acronym for Hypertext Preprocessor. (It repeats the idea that the first word itself is an abbreviation, so the full definition does not follow the abbreviation.)
The first version of PHP was released 26 years ago. It is now available in version 8, released in November 2020, but version 7 is still the most used. PHP runs on the Zend engine, which is the most popular implementation. There are also other implementations, such as parrot, HPVM (Hip Hop Virtual Machine) and Hip Hop, created by Facebook. PHP is often used to create web servers. It runs in the browser and can be run from the command line. So if you don’t like viewing the output of your code in a browser, you can view it locally.
Why use PHP
PHP is a server-side scripting language, used to design powerful web applications using a MySQL database.
It handles robust content, database and time tracking for websites. You can create sessions in PHP.
It can access cookie settings and set cookies. This helps with data encryption and enforcement.
PHP supports many protocols like HTTP, POP3, SNMP, LDAP, IMAP and many more. By using the PHP language, you can control the user to access certain pages of your website.
Since PHP is easy to install and configure, this is the main reason why PHP is the best language to learn. PHP can handle forms, such as – collect user data using forms, store it in the database and return useful information to the user. For example – registration form.
The source code configuration
PHP has two main subsystems, ZE (Zend Engine) and PHP core.
Ze is responsible for translating PHP text into machine code (also becoming a symbolic feature), executing this machine code in the process space, Ze is responsible for memory management, controlling the scope of changes and distribution management of PHP function. . PHP core is for communicating with the SAPI layer, and PHP core also provides a layer for Safe_mode, open_basedir checking, and PHP core provides a stream layer for file and network I/O operations of the user domain. where SAPI (Server Application Programming Interface) usually has host locations like nginx, apache, iis, cli, cgi. PHP extensions provide encapsulation of functions similar to the core PHP, such as reading and writing to Mysql, redis, memcache, sqlite, parsing of json, xml files, encapsulation of Soap network protocols, socket, curl, encapsulation of encryption, decryption and decompression. , encapsulation of image processing and more. Some extensions work from scratch, such as using the C for REDIS communication protocol to communicate with Redis, and some extensions by calling existing libraries, which require the system itself to have a library GD corresponds. Extension 78 is available in PHP source code Php-5.6.24/ext.
In summary, the resources provided by Ze and PHP core provide different functions for the user domain through EXT (extend). Take the source code of php-5.6.24 as an example, the corresponding folder php-5.6.24/zend, the PHP core folder Php-5.6.24/main, the extension folder corresponding to Php-5.6.24/ext.
Function of PHP
PHP functionality is similar to other programming languages. A function is a piece of code that takes input in the form of parameters, performs some operation, and returns a value. You have already seen many functions like fopen() and fread() etc. These are built in but PHP also gives you the option to create your own functions. There are two aspects that you need to be clear about –
Creating a PHP project
Calling a PHP function
Of course, you need to create your own PHP project because there are already more than 1000 built-in libraries for different domains and you just need to call them according to your needs.
PHP is open source and free, which enables developers to quickly install it and make it ready for use. There are many PHP frameworks and a developer can choose any framework to work with. Developers will be provided with all plans and tools for this process. As it is open-source, it makes the system ready in PHP in no time and speeds up web development by providing tools and other features.
Improved download speed
Using PHP makes web pages load faster than most other web development technologies. For example, PHP is currently about three times faster than Python for most usage scenarios. On the other hand, reducing the loading time is an important SEO quality factor that helps to promote the website further by bringing a competitive advantage. High speed makes customers happy and, in addition to other benefits, helps build and retain customers.
Compatibility with cloud services
Many modern products these days often use cloud solutions like Amazon Web Services for various purposes. Applications written in PHP are supported by various cloud services, such as AWS Lambda, for example. Therefore, PHP applications can be deployed on a cloud server and get maximum scalability and other useful effects. Also, the domain of the cloud is not controlled by other coding languages, so PHP has taken its place in such programs.
A wide selection of professionals is available
The popularity of PHP has resulted in a large community of developers, few of whom may be employable. The large number of available professionals results in high competition and low salaries, which is beneficial in reducing development costs. Also, this language is easy to learn and implement, so even novice developers can easily understand the basic functions of the application.