PHP became popular for web development due to its ease of learning, seamless integration with HTML, widespread hosting support, and a large ecosystem including frameworks like Laravel and CMS platforms like WordPress. It excels in handling form submissions, managing user sessions, interacting with databases, and generating dynamic content. Common use cases include processing login forms, managing shopping carts, and creating user dashboards. PHP runs server-side, meaning it processes data behind the scenes and sends only the resulting HTML, CSS, and JavaScript to the browser. The workflow involves a visitor requesting a page, the server executing the PHP code, and delivering the final output quickly and efficiently.

PHP is a server-side scripting language designed specifically for web development. It’s used to create dynamic websites and power applications by generating HTML content that gets sent to the browser. Unlike static HTML, PHP can interact with databases, handle form submissions, manage user sessions, and more — all behind the scenes before a page loads.

Why PHP Became Popular for Web Development

When people ask why PHP is still around after so many years, it’s because of how well it fits into the web development ecosystem. Here are some key reasons:

• Easy to learn: Compared to other backend languages like Python or Ruby, PHP has a lower learning curve. You can start writing basic scripts in minutes.
• Built for the web: PHP was created with web development in mind. It integrates smoothly with HTML and works directly on the server where the website is hosted.
• Runs on most hosting platforms: Most web hosting providers support PHP out of the box, making deployment simple.
• Large community and ecosystem: WordPress, Drupal, and Laravel are all built with PHP, which means there's a ton of documentation, plugins, and frameworks available.

If you're building a blog, an e-commerce site, or even a custom CMS, PHP gives you the tools to do it quickly and efficiently.

Common Use Cases Where PHP Shines

PHP really stands out when you need to build something that involves handling data from users. Here are a few typical scenarios:

• Processing login forms
• Managing shopping carts
• Creating user dashboards
• Storing and retrieving data from a database (like MySQL)

For example, when someone fills out a contact form on a website, PHP can take that data, validate it, and store it in a database or send it via email. This kind of interaction is exactly what PHP was made for.

One thing to note: PHP runs on the server, not in the browser. That means users never see the actual PHP code — only the HTML, CSS, and JavaScript output that the PHP script generates.

How PHP Works Behind the Scenes

Here’s a quick look at how PHP does its job:

1. A visitor requests a webpage.
2. The server sees that the page uses PHP and runs the code.
3. PHP processes any logic — like pulling data from a database.
4. The final result (usually HTML) is sent back to the browser.

This process happens fast and behind the scenes. Because PHP is embedded directly into HTML files (using <?php ... ?> tags), it makes mixing dynamic and static content very straightforward.

You don’t need a lot of setup to get started either — just a web server with PHP installed, like Apache or Nginx, and you're good to go.

That’s basically why PHP remains a solid choice for web development, especially when you need something that works reliably without a steep learning curve. It might not be the newest or trendiest language, but for building functional, data-driven websites, it's still widely used and supported.

The above is the detailed content of What is PHP, and why is it used for web development?. For more information, please follow other related articles on the PHP Chinese website!