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Go Beyond Basic HTML: Add Functionality and Interactivity with PHP
- 王林Original
- 2024-10-10 14:50:21754browse
PHP is a server-side scripting language used to extend HTML, adding interactivity and dynamic functionality. Used in conjunction with HTML, PHP can process forms, query databases, and create dynamic content to build interactive and fully functional websites.
Beyond basic HTML: Add functionality and interactivity with PHP
Introduction
Although HTML is the basis for building websites, it lacks interactivity and advanced features. PHP (Hypertext Preprocessing Language) is a server-side scripting language that can extend your HTML to a higher level when you want to add functionality that requires dynamic updates or user interaction.
Practical Example: Creating a Login Form
Let’s create a login form that uses PHP to verify user credentials:
<!DOCTYPE html>
<html>
<head>
<title>Login Form</title>
</head>
<body>
<h1>Login</h1>
<form action="login.php" method="post">
<label for="username">Username:</label>
<input type="text" name="username" id="username">
<br>
<label for="password">Password:</label>
<input type="password" name="password" id="password">
<br>
<input type="submit" value="Login">
</form>
</body>
</html><?php
// Connect to the database
$con = mysqli_connect("localhost", "root", "password", "db_name");
// Check if form is submitted
if (isset($_POST['username'])) {
$username = mysqli_real_escape_string($con, $_POST['username']);
$password = mysqli_real_escape_string($con, $_POST['password']);
// Query the database to check if user exists
$query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
$result = mysqli_query($con, $query);
// If user exists, redirect to welcome page
if (mysqli_num_rows($result) == 1) {
header("Location: welcome.php");
} else {
echo "Invalid username or password";
}
}
?>How PHP works
PHP code is executed on the server, modifying the HTML page before sending it to the browser. It uses 5c8da1d8b4c5a9634193c26feb258147 tags to embed PHP code into HTML.
In this example:
- We connect to the database and get the form data.
- We search the database for the user credentials and if a match is found, we use the
header()function to redirect to the welcome page. - If no match is found, we display an error message.
Conclusion
By using PHP with HTML, you can create interactive, full-featured applications. From handling forms to creating dynamic content, PHP offers endless possibilities for going beyond static websites.
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