Lernen GET vs POST Methods | Working with Forms

When you work with forms in PHP, you must choose between the GET and POST methods for submitting user data. Each method has unique characteristics, advantages, and limitations. Understanding these differences is essential for building secure and reliable web applications.

The GET method appends form data to the URL as query parameters. This means the submitted information becomes visible in the browser's address bar and can be bookmarked or shared easily. GET is typically used for retrieving data or performing actions that do not modify server state, such as searching or filtering. However, because the data is exposed in the URL, GET is not suitable for sensitive information like passwords or personal details. Additionally, URLs have length limitations, so GET is not ideal for submitting large amounts of data.

get_form.php


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<!DOCTYPE html>
<html>
<head>
    <title>GET Form Example</title>
</head>
<body>
    <form method="get" action="get_form.php">
        <label for="name">Name:</label>
        <input type="text" name="name" id="name">
        <input type="submit" value="Submit via GET">
    </form>
    <?php
    if (isset($_GET['name'])) {
        echo "<p>You submitted: " . htmlspecialchars($_GET['name']) . "</p>";
    }
    ?>
</body>
</html>

In contrast, the POST method sends form data in the request body, making it invisible in the URL. POST is commonly used for actions that change server data, such as creating accounts, submitting orders, or uploading files. Since data is not displayed in the address bar, POST is more appropriate for sensitive information. However, it is important to note that POST requests are not inherently secure data can still be intercepted if the connection is not encrypted (for example, if HTTPS is not used).

post_form.php


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<!DOCTYPE html>
<html>
<head>
    <title>POST Form Example</title>
</head>
<body>
    <form method="post" action="post_form.php">
        <label for="email">Email:</label>
        <input type="email" name="email" id="email">
        <input type="submit" value="Submit via POST">
    </form>
    <?php
    if (isset($_POST['email'])) {
        echo "<p>You submitted: " . htmlspecialchars($_POST['email']) . "</p>";
    }
    ?>
</body>
</html>

Choosing the right method depends on your application's requirements. Use GET for simple, idempotent requests where data exposure is not a concern. Use POST when handling confidential or large data, or when the request will modify server-side resources.

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Abschnitt 2. Kapitel 2

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get_form.php


              123456789101112131415161718
            
<!DOCTYPE html>
<html>
<head>
    <title>GET Form Example</title>
</head>
<body>
    <form method="get" action="get_form.php">
        <label for="name">Name:</label>
        <input type="text" name="name" id="name">
        <input type="submit" value="Submit via GET">
    </form>
    <?php
    if (isset($_GET['name'])) {
        echo "<p>You submitted: " . htmlspecialchars($_GET['name']) . "</p>";
    }
    ?>
</body>
</html>

post_form.php


              123456789101112131415161718
            
<!DOCTYPE html>
<html>
<head>
    <title>POST Form Example</title>
</head>
<body>
    <form method="post" action="post_form.php">
        <label for="email">Email:</label>
        <input type="email" name="email" id="email">
        <input type="submit" value="Submit via POST">
    </form>
    <?php
    if (isset($_POST['email'])) {
        echo "<p>You submitted: " . htmlspecialchars($_POST['email']) . "</p>";
    }
    ?>
</body>
</html>

War alles klar?

Danke für Ihr Feedback!

Abschnitt 2. Kapitel 2