PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML.
What distinguishes PHP from something like client-side JavaScript is that the code is executed on the server, generating HTML which is then sent to the client. The client would receive the results of running that script, but would not know what the underlying code was. You can even configure your web server to process all your HTML files with PHP, and then there's really no way that users can tell what you have up your sleeve.
PHP files can contain text, HTML, CSS, JavaScript, and PHP code
PHP code is executed on the server, and the result is returned to the browser as plain HTML.
PHP files have extension ".php"
What Can PHP Do?
PHP can generate dynamic page content
PHP can create, open, read, write, delete, and close files on the server
PHP can collect form data
PHP can send and receive cookies
PHP can add, delete, modify data in your database
PHP can be used to control user-access
PHP can encrypt data
With PHP you are not limited to output HTML. You can output images or PDF files. You can also output any text, such as XHTML and XML.
Key Features:
Lightweight framework
Excellent documentation
MVC architecture support
Built-in security features
Key Features:
Lightweight framework
Excellent documentation
MVC architecture support
Built-in security features
Key Features:
Individual components settings
Built-in debugging
Twig template engine
Excellent documentation
Key Features:
MVC architecture
Integration with external libraries
Allows using only the components you need
Rapid Development
Key Features:
Based on the C programming language
Fantastic performance and low resource overhead
Possible to add only the needed modules and libraries
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CSS frameworks are libraries that make web page styling easier. Some of them are Foundation, Bootstrap, Gumby, Ukit, Semantic UI, etc.
The CSS box model defines the layout and design of CSS elements. The elements are content (like text and images, padding (the area around content), border (the area around padding), and margin (the area around the border).
There are three ways of integrating CSS into HTML: using style tags in the head section, using inline-styling, writing CSS in a separate file, and linking into the HTML page by the link tag.
RGB represents colors in CSS. The three streams are namely Red, Green, and Blue. The intensity of colors is represented using numbers 0 to 256. This allows CSS to have a spectrum of visible colors.
CSS was developed to define the visual appearances of websites. It allows developers to separate the structure and content of a website that was not possible before.
