PHP是服務(wù)器端腳本語言，專為網(wǎng)頁開發(fā)設(shè)計。它在服務(wù)器上運行，處理代碼後將HTML等內(nèi)容髮送至瀏覽器。與客戶端腳本（如JavaScript）不同，用戶看不到實際PHP代碼，僅見其生成的輸出。例如，PHP可連接數(shù)據(jù)庫並動態(tài)顯示產(chǎn)品列表。 PHP流行的原因包括：1. 易於學(xué)習(xí)；2. 專為網(wǎng)頁開發(fā)設(shè)計；3. 廣泛支持；4. 擁有大型生態(tài)系統(tǒng)；5. 開源且靈活。 PHP可直接嵌入HTML文件中，通過本地服務(wù)器環(huán)境（如XAMPP）測試運行?？傊?，PHP是高效生成動態(tài)內(nèi)容的強(qiáng)大工具。
PHP is a server-side scripting language designed for web development, but it can also be used as a general-purpose programming language. If you're new to PHP or looking to understand what makes it tick, the key idea is simple: PHP runs on the server, processes your code, and sends HTML (or other types of content) back to the browser.
What Exactly Is Server-Side Scripting?
Server-side scripting means that the code runs on the web server, not in the user's browser. When someone visits a webpage built with PHP, the server processes the PHP code first, executes any instructions (like fetching data from a database), and then sends the resulting HTML to the browser.
This is different from client-side scripting (like JavaScript), which runs after the page reaches the browser. With PHP, users never see the actual PHP code — only the output it generates.
For example:
- You have a PHP script that connects to a database and displays a list of products.
- The server runs this script when someone requests the page.
- It fetches product data, formats it into HTML, and sends that HTML to the visitor's browser.
Why Use PHP for Web Development?
There are several reasons why PHP has remained popular over the years:
- Easy to learn : PHP syntax is straightforward, especially if you already know a bit of C, Java, or JavaScript.
- Built for the web : PHP was created specifically for generating dynamic web pages, so it integrates smoothly with HTML.
- Widely supported : Most web hosting providers support PHP out of the box, making deployment easy.
- Large ecosystem : Popular tools like WordPress, Drupal, and Laravel are all powered by PHP.
- Open source : PHP is free to use and has a strong community contributing to its growth and documentation.
It's also flexible — you can write small scripts or build large applications using object-oriented programming and modern frameworks.
How Does PHP Fit Into a Web Page?
Let's say you're building a simple blog. Here's how PHP might come into play:
- A user visits
index.phpin their browser. - The server sees the
.phpextension and knows to run the PHP code inside the file. - That PHP code may connect to a MySQL database to retrieve recent blog posts.
- Once retrieved, PHP loops through the results and builds an HTML structure — maybe a list of post titles and excerpts.
- The final HTML is sent back to the browser, where the user sees the rendered blog homepage.
You can embed PHP directly into HTML files like this:
<!DOCTYPE html> <html> <body> <?php echo "Hello, world!"; ?> </body> </html>
When viewed in a browser, the user just sees “Hello, world!” — not the PHP code itself.
Setting Up a Basic PHP Environment
To start writing PHP, you need a few things:
- A text editor (like VS Code, Sublime Text, or even Notepad).
- A local server environment — options include XAMPP, WAMP, or MAMP.
- A browser to test your pages.
Once installed, place your .php files in the correct directory (like htdocs in XAMPP), start Apache, and visit http://localhost/yourfile.php in your browser.
If you're working on a live website, upload your PHP files to your web host via FTP or a control panel like cPanel.
That's the basic idea behind PHP and how it works on the server side. It's not magic — just a powerful tool that helps generate dynamic content efficiently.
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