PHP Forms | asadmukhtar.info

PHP Forms | asadmukhtar.info

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PHP Forms (Form Handling and Validation) 📄

Forms in PHP allow users to input data, which can be processed using PHP. Form handling includes receiving data from a form, and validation ensures the input is correct and secure.

PHP Form Handling

PHP uses the $_GET and $_POST superglobals to collect form data.

📝 Example: Handling Form Data (POST Method)

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    echo "Hello, " . htmlspecialchars($name);
}
?>
<form method="POST">
    <input type="text" name="name" required>
    <button type="submit">Submit</button>
</form>

✔ $_POST["name"] captures input data.
✔ htmlspecialchars() prevents XSS attacks.
✔ The form submits data using POST (secure for sensitive data).

PHP Form Validation

Form validation ensures the correctness and security of user input.

Common Validations:

✅ Required Fields: Ensure the field is not empty.
✅ String Length: Limit the number of characters.
✅ Email Validation: Check for a valid email format.
✅ Numeric Validation: Ensure the input contains only numbers.

📝 Example: Validating Form Input

<?php
$nameErr = ""; $name = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = empty($_POST["name"]) ? $nameErr = "Name is required" : htmlspecialchars($_POST["name"]);
}
?>
<form method="POST">
    Name: <input type="text" name="name"> <span><?php echo $nameErr; ?></span>
    <button type="submit">Submit</button>
</form>

✔ Ensures the field is not empty.
✔ Displays error messages.

PHP Form Security

$name = filter_var($_POST["name"], FILTER_SANITIZE_STRING);
$email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);

✔ Prevents malicious input.

Conclusion

✔ PHP Forms collect data.
✔ Validation checks correctness.
✔ Sanitization ensures security.

Secure form handling is crucial for safe web applications!