Form handling execution flow in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the form was submitted using POST method.

PHP

<?php
if ($_SERVER['REQUEST_METHOD'] == '[1]') {
    echo "Form submitted!";
}
?>

Drag options to blanks, or click blank then click option'

AGET

BDELETE

CPUT

DPOST

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'GET' instead of 'POST' to check the form submission.

Not using quotes around the method name.

The form submission method is checked by comparing $_SERVER['REQUEST_METHOD'] to POST.

2fill in blank

medium

Complete the code to safely get the submitted username from the form.

PHP

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['[1]'] ?? '';
    echo "Hello, " . htmlspecialchars($username);
}
?>

Drag options to blanks, or click blank then click option'

Ausername

Bname

Cuser

Dlogin

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong key like 'user' or 'name' that does not match the form field.

Not using the null coalescing operator to avoid undefined index errors.

The form field name for the username is usually 'username'. Using $_POST['username'] retrieves the submitted value.

3fill in blank

hard

Fix the error in the code to check if the form was submitted and the email field is not empty.

PHP

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST' && !empty($_POST['[1]'])) {
    echo "Email received.";
}
?>

Drag options to blanks, or click blank then click option'

Ae-mail

Bmail

Cemail

Duser_email

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect field names like 'mail' or 'e-mail'.

Not checking if the field is empty before processing.

The form field for email is usually named 'email'. Checking !empty($_POST['email']) ensures the field is filled.

4fill in blank

hard

Fill both blanks to create an associative array of submitted form data with keys 'name' and 'age'.

PHP

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $data = [
        '[1]' => $_POST['name'],
        '[2]' => (int)$_POST['age']
    ];
    print_r($data);
}
?>

Drag options to blanks, or click blank then click option'

Aname

Busername

Cage

Dyears

Attempts:

3 left

💡 Hint

Common Mistakes

Using keys that do not match the form fields.

Mixing up 'age' and 'years' as keys.

The array keys should match the data they hold: 'name' for the name and 'age' for the age.

5fill in blank

hard

Fill all three blanks to validate and sanitize the submitted email and password fields.

PHP

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $email = filter_var($_POST['[1]'], FILTER_VALIDATE_EMAIL);
    $password = trim($_POST['[2]']);
    if ($email && strlen($password) >= [3]) {
        echo "Valid input.";
    } else {
        echo "Invalid input.";
    }
}
?>

Drag options to blanks, or click blank then click option'

Aemail

Bpassword

C8

D6

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong field names like 'user_email' or 'pass'.

Setting password length too low or forgetting to trim whitespace.

The email field is named 'email', the password field 'password', and a common minimum password length is 8 characters.