time.php<\/code> :<\/p> \n\nCurrent Time<\/title><\/head>\n\n \n It's currently .<\/p>\n<\/body>\n<\/html><\/pre>
Now both pages can share the same header — change it once, update everywhere.<\/p>
? Use include<\/code> , require<\/code> , include_once<\/code> , or require_once<\/code> depending on whether you want errors to stop execution ( require<\/code> ) or allow missing files ( include<\/code> ).<\/p><\/blockquote>
5. Quick Tips for Getting Started<\/h3>
Here are a few things that'll save you time:<\/p>
Check for errors<\/strong> : Add this at the top of your PHP files during development:<\/p> <\/pre><\/li>
Variables start with $<\/code><\/strong> — like $username<\/code> , $count<\/code> , etc.<\/p><\/li> Arrays are super useful<\/strong> :<\/p> $colors = ['red', 'green', 'blue'];\nforeach ($colors as $color) {\n echo \"My favorite color is $color<\/p>\";\n}<\/pre><\/li>\n
- \n
Always sanitize user input<\/strong> — never trust what users send. Use:<\/p>\n\n-
htmlspecialchars()<\/code> for output<\/li>\n-
filter_var()<\/code> for validation (eg, emails)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
\n You've now built a dynamic page that responds to input, displays real-time data, and reuses components. That's already more than many live websites do.<\/p>\n
From here, you can connect to databases (with MySQLi or PDO), build login systems, or create a simple blog. But for now, pat yourself on the back — you've crossed the static-to-dynamic threshold.<\/p>\n
Basically, just remember: PHP runs on the server, outputs HTML, and gives you control over what shows up based on data, time, or user actions. The rest is just practice.<\/p>\n
And hey — your first dynamic page is done. Not magic, just code.<\/p>"}
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構(gòu)建您的第一個動態(tài)網(wǎng)頁:實用的PHP底漆
構(gòu)建您的第一個動態(tài)網(wǎng)頁:實用的PHP底漆
Jul 29, 2025 am 04:58 AM
PHP Introduction
<p>安裝XAMPP/MAMP或使用PHP內(nèi)置服務(wù)器並確保文件保存為.php擴展名;2. 在hello.php中用<?php echo date('Ymd H:i:s'); ?>顯示當前時間;3. 在greet.php中通過$_GET獲取用戶輸入並用htmlspecialchars()防止XSS;4. 使用include 'header.php';復(fù)用頁面頭部;5. 開發(fā)時啟用錯誤報告、變量以$開頭、用數(shù)組存儲數(shù)據(jù)、始終過濾用戶輸入。你已創(chuàng)建出能響應(yīng)用戶輸入、顯示動態(tài)內(nèi)容並複用代碼的動態(tài)網(wǎng)頁,這是邁向完整Web應(yīng)用的關(guān)鍵一步,後續(xù)可連接數(shù)據(jù)庫或構(gòu)建登錄系統(tǒng),但此時應(yīng)肯定自己已成功實現(xiàn)從靜態(tài)到動態(tài)的跨越。 </p>
<p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175373629354889.jpg" class="lazy" alt="Building Your First Dynamic Web Page: A Practical PHP Primer"></p>
<p> So you've got a static HTML page up and running — great start. But now you want your website to <em>do</em> things: show different content based on user input, display the current time, or maybe pull data from a database. That's where PHP comes in. </p>
<img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175373629487184.jpeg" class="lazy" alt="Building Your First Dynamic Web Page: A Practical PHP Primer"><p> PHP is a server-side scripting language that lets you add dynamic behavior to your web pages. When someone visits a PHP page, the server runs the PHP code first, generates HTML, and sends that HTML to the browser. The user never sees the PHP code — just the result.</p>
<p> Let's walk through building your first dynamic web page using PHP, step by step. No fluff — just what you need to know to get something working. </p>
<img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175373629554497.jpeg" class="lazy" alt="Building Your First Dynamic Web Page: A Practical PHP Primer"><hr>
<h3 id="Setting-Up-a-Basic-PHP-Environment"> 1. Setting Up a Basic PHP Environment</h3>
<p> Before you write any code, make sure you can run PHP locally.</p>
<ul>
<li>
<p> <strong>Option 1 (Easiest): Use XAMPP or MAMP</strong><br> Download <a href="http://ipnx.cn/link/41371be284c70c592049717c38e42081">XAMPP</a> (Windows, Linux) or <a href="http://ipnx.cn/link/6627a69dbc37004e43fe0e1b18086f3a">MAMP</a> (Mac). These packages include Apache (web server), MySQL, and PHP — everything you need. </p>
<img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175373629615962.jpeg" class="lazy" alt="Building Your First Dynamic Web Page: A Practical PHP Primer">
</li>
<li>
<p> <strong>Option 2: Built-in PHP Server (Quick test)</strong><br> If PHP is already installed ( <code>php -v</code> in terminal), navigate to your project folder and run:</p><pre class='brush:php;toolbar:false;'> php -S localhost:8000</pre><p> Then visit <code>http://localhost:8000</code> in your browser.</p></li></ul><blockquote><p> ?? Important: Save your files with a <code>.php</code> extension (eg, <code>index.php</code> ), not <code>.html</code> . Only <code>.php</code> files get processed by the PHP engine.</p></blockquote><hr /><h3 id="Your-First-Dynamic-Output"> 2. Your First Dynamic Output</h3><p> Create a file called <code>hello.php</code> in your web server's root folder (like <code>htdocs</code> for XAMPP or <code>htdocs</code> in MAMP).</p><pre class='brush:php;toolbar:false;'> <!DOCTYPE html>
<html>
<head>
<title>My First Dynamic Page</title>
</head>
<body>
<h1>Welcome!</h1>
<p>The current time is: <?php echo date('Ymd H:i:s'); ?></p>
</body>
</html></pre><p> Now open it in your browser: <code>http://localhost:8000/hello.php</code></p><p> You should see something like:</p><blockquote><p> The current time is: 2025-04-05 14:32:10</p></blockquote><p> That <code><?php ... ?></code> block is where the magic happens. The server runs <code>date()</code> and outputs the result directly into the HTML.</p><blockquote><p> ? Note: <code>echo</code> is how you output text in PHP. Think of it like <code>console.log()</code> but for sending content to the page.</p></blockquote><hr /><h3 id="Handling-User-Input-with-Forms"> 3. Handling User Input with Forms</h3><p> Let's make your page respond to user input. Create <code>greet.php</code> :</p><pre class='brush:php;toolbar:false;'> <!DOCTYPE html>
<html>
<head>
<title>Greeting Form</title>
</head>
<body>
<form method="GET">
<label for="name">Enter your name:</label>
<input type="text" id="name" name="name" />
<button type="submit">Greet Me</button>
</form>
<?php
if (isset($_GET['name'])) {
$name = htmlspecialchars($_GET['name']);
echo "<p>Hello, <strong>$name</strong>! Welcome to dynamic PHP.</p>";
}
?>
</body>
</html></pre><p> Now when you type a name and submit:</p><ul><li> The form sends the data via URL (you'll see <code>?name=Bob</code> in the address bar).</li><li> PHP checks if <code>$_GET['name']</code> exists.</li><li> It grabs the value, runs it through <code>htmlspecialchars()</code> (security must!), and displays a personalized message.</li></ul><blockquote><p> ? Why <code>htmlspecialchars()</code> ? It prevents XSS attacks by converting special characters like <code><</code> into safe HTML entities.</p></blockquote><hr /><h3 id="Including-Files-and-Reusing-Code"> 4. Including Files and Reusing Code</h3><p> One of PHP's strengths is code reuse. Let's split out a header.</p><p> Create <code>header.php</code> :</p><pre class='brush:php;toolbar:false;'> <h1>? My Awesome Site</h1>
<nav>
<a href="greet.php">Greet</a> |
<a href="time.php">Time</a>
</nav>
<hr /></pre><p>Then in <code>time.php</code> :</p><pre class='brush:php;toolbar:false;'> <!DOCTYPE html>
<html>
<head><title>Current Time</title></head>
<body>
<?php include 'header.php'; ?>
<p>It's currently <?php echo date('l, F j, Y'); ?>.</p>
</body>
</html></pre><p> Now both pages can share the same header — change it once, update everywhere.</p><blockquote><p> ? Use <code>include</code> , <code>require</code> , <code>include_once</code> , or <code>require_once</code> depending on whether you want errors to stop execution ( <code>require</code> ) or allow missing files ( <code>include</code> ).</p></blockquote><hr /><h3 id="Quick-Tips-for-Getting-Started"> 5. Quick Tips for Getting Started</h3><p> Here are a few things that'll save you time:</p><ul><li><p> <strong>Check for errors</strong> : Add this at the top of your PHP files during development:</p><pre class='brush:php;toolbar:false;'> <?php error_reporting(E_ALL); ini_set('display_errors', 1); ?></pre></li><li><p> <strong>Variables start with <code>$</code></strong> — like <code>$username</code> , <code>$count</code> , etc.</p></li><li><p> <strong>Arrays are super useful</strong> :</p><pre class='brush:php;toolbar:false;'> $colors = ['red', 'green', 'blue'];
foreach ($colors as $color) {
echo "<p>My favorite color is $color</p>";
}</pre></li>
<li>
<p> <strong>Always sanitize user input</strong> — never trust what users send. Use:</p>
<ul>
<li> <code>htmlspecialchars()</code> for output</li>
<li> <code>filter_var()</code> for validation (eg, emails)</li>
</ul>
</li>
</ul>
<hr>
<p> You've now built a dynamic page that responds to input, displays real-time data, and reuses components. That's already more than many live websites do.</p>
<p> From here, you can connect to databases (with MySQLi or PDO), build login systems, or create a simple blog. But for now, pat yourself on the back — you've crossed the static-to-dynamic threshold.</p>
<p> Basically, just remember: PHP runs on the server, outputs HTML, and gives you control over what shows up based on data, time, or user actions. The rest is just practice.</p>
<p> And hey — your first dynamic page is done. Not magic, just code.</p>
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