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Renamed folders and files of 2_Intermediate folder
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‎2_Intermediate/10_checkcookie.php‎

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<?php
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setcookie("test_cookie", "test", time() + 5);
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if (count($_COOKIE) > 0) {
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echo "Cookies are enabled.";
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} else {
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echo "Cookies are disabled.";
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}

‎2_Intermediate/11_setcookie.php‎

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<?php
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echo "Welcome to the world of cookies<br>";
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echo time();
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setcookie("category", "Books", time() + 86400, "/");
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echo "The cookie is set<br>";

‎2_Intermediate/12_createcookie1.php‎

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<?php
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$cookie_name = "user";
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$cookie_value = "nav kaur";
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setcookie($cookie_name, $cookie_value, time() + 5); // 86400 = 1 day
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if (isset($_COOKIE[$cookie_name])) {
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echo "Cookie '" . $cookie_name . "' has been set<br>";
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echo "Value is: " . $_COOKIE[$cookie_name];
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} else {
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echo "Cookie '" . $cookie_name . "' is not set";
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}

‎2_Intermediate/13_cookieform.php‎

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<form action="" method="POST">
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<input type="text" name="user">
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<input type="submit" name="set" value="set">
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<input type="submit" name="del" value="del">
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</form>
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<?php
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if (isset($_POST['set'])) {
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$cookie1 = $_POST['user'];
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setcookie($cookie1, $cookie1, time() + 3600);
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?>
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<?php
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if (isset($_COOKIE[$cookie1])) {
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echo "Cookie '" . $cookie1 . "' has been set<br>";
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echo "Value is: " . $_COOKIE[$cookie1];
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} else {
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echo "Cookie '" . $cookie1 . "' is not set";
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}
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}
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?>
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<?php
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if (isset($_POST['del'])) {
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$cookie1 = $_POST['user'];
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setcookie($cookie1, "", time() - 3600);
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echo $_COOKIE[$cookie1] . " has been deleted";
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}
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?>

‎2_Intermediate/1_getMethod.php‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Get Method</title>
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<style>
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form {
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margin: 20px;
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padding: 20px;
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border: 1px solid #ccc;
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border-radius: 5px;
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background-color: #f2f2f2;
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}
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input[type="text"],
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input[type="number"] {
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margin-bottom: 10px;
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padding: 5px;
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width: 200px;
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border: 1px solid #ccc;
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border-radius: 3px;
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}
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input[type="submit"] {
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padding: 5px 10px;
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background-color: #4CAF50;
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color: white;
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border: none;
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border-radius: 3px;
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cursor: pointer;
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}
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</style>
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</head>
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<body>
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<form action="1_getMethod.php" method="get">
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<input type="text" name="name" placeholder="Enter your name">
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<input type="number" name="age" placeholder="Enter your age">
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<input type="submit" value="Submit">
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</form>
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<?php
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if (isset($_GET['name'])) {
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echo "Hello, " . $_GET['name'];
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} else if (isset($_GET['age'])) {
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echo "Your age is " . $_GET['age'];
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}
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?>
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</body>
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</html>

‎2_Intermediate/2_postMethod.php‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Post Method</title>
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<style>
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form {
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margin: 20px;
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padding: 20px;
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border: 1px solid #ccc;
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border-radius: 5px;
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background-color: #f2f2f2;
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}
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input[type="text"],
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input[type="number"] {
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margin-bottom: 10px;
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padding: 5px;
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width: 200px;
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border: 1px solid #ccc;
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border-radius: 3px;
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}
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input[type="submit"] {
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padding: 5px 10px;
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background-color: #4CAF50;
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color: white;
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border: none;
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border-radius: 3px;
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cursor: pointer;
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}
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</style>
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</head>
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<body>
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<form action="2_postMethod.php" method="post">
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<input type="text" name="name" placeholder="Enter your name">
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<input type="number" name="age" placeholder="Enter your age">
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<input type="submit" value="Submit">
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</form>
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<?php
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if (isset($_POST['name'])) {
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echo "Hello, " . $_POST['name'];
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} else if (isset($_POST['age'])) {
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echo "Your age is " . $_POST['age'];
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}
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?>
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</body>
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</html>

‎2_Intermediate/3_requestVariable.php‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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<form action="3_requestVariable.php" method="get">
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<input type="text" name="name" placeholder="Enter your name">
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<input type="number" name="age" placeholder="Enter your age">
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<input type="submit" value="Submit">
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</form>
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<?php
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if ($_SERVER['REQUEST_METHOD'] == 'POST') {
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echo "You have submitted the form using POST method";
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} else if ($_SERVER['REQUEST_METHOD'] == 'GET') {
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echo "You have submitted the form using GET method";
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}
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?>
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</body>
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</html>

‎2_Intermediate/4_GlobalVariables.md‎

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# Superglobals
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In PHP, superglobals are built-in global arrays that are available across all scopes (global, function, class) without the need for global declarations. They are automatically populated by the server with information, typically regarding server, environment, and user input data. These arrays are accessible from anywhere in the script.
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<br/>
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Here are the key PHP superglobals:
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<br/>
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1. `$_GET`: Contains variables passed to the script via the URL query string (i.e., after the ? in the URL).
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```php
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echo $_GET['name']; // URL: script.php?name=John
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```
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2. `$_POST`: Contains data passed to the script via an HTTP POST request (commonly from HTML forms).
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```php
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echo $_POST['username']; // Retrieved from an HTML form submission
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```
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3. `$_REQUEST`: A combination of $_GET, $_POST, and $_COOKIE data.
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```php
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echo $_REQUEST['email']; // Can retrieve from GET, POST, or cookies
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```
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4. `$_SERVER`: Contains information about headers, paths, and script locations.
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```php
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echo $_SERVER['HTTP_USER_AGENT']; // Shows browser information
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echo $_SERVER['REQUEST_METHOD']; // Shows the request method (GET, POST, etc.)
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```
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5. `$_FILES`: Contains information about files uploaded via an HTTP POST request.
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```php
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echo $_FILES['file']['name']; // Name of the uploaded file
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```
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6. `$_ENV`: Contains environment variables passed to the current script.
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```php
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echo $_ENV['HOME']; // Access an environment variable
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```
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7. `$_COOKIE`: Contains variables passed to the script via HTTP cookies.
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```php
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echo $_COOKIE['user']; // Retrieved from the user's browser cookies
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```
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8. `$_SESSION`: Used to store session variables for use across multiple pages.
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```php
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$_SESSION['user'] = 'John';
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```
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9. `$GLOBALS`: It is a superglobal associative array. This superglobal can be used to access global variables from anywhere in the script. Takes variable names as the key.
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```php
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$x = 10;
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function test() {
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echo $GLOBALS['x']; // Accesses the global variable $x
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}
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```

‎2_Intermediate/5_validation.php‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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<style>
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.error {
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color: red;
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}
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</style>
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</head>
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<body>
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<?php
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// Define variables and set to empty values
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$nameErr = $emailErr = $genderErr = $websiteErr = "";
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$name = $email = $gender = $comment = $website = "";
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// Check if the form was submitted
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if ($_SERVER["REQUEST_METHOD"] == "POST") {
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// Validate name
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if (empty($_POST["name"])) {
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$nameErr = "Name is required";
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} else {
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$name = test_input($_POST["name"]);
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}
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// Validate email
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if (empty($_POST["email"])) {
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$emailErr = "Email is required";
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} else {
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$email = test_input($_POST["email"]);
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// Check if email is valid
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if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
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$emailErr = "Invalid email format";
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}
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}
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// Validate website
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if (empty($_POST["website"])) {
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$website = ""; // Optional field
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} else {
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$website = test_input($_POST["website"]);
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// Check if website URL is valid
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if (!filter_var($website, FILTER_VALIDATE_URL)) {
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$websiteErr = "Invalid URL format";
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}
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}
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// Validate comment (optional field)
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if (!empty($_POST["comment"])) {
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$comment = test_input($_POST["comment"]);
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}
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// Validate gender
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if (empty($_POST["gender"])) {
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$genderErr = "Gender is required";
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} else {
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$gender = test_input($_POST["gender"]);
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}
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}
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// Function to sanitize form input data
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function test_input($data)
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{
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$data = trim($data); // Remove whitespace
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$data = stripslashes($data); // Remove slashes
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$data = htmlspecialchars($data); // Convert special characters
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return $data;
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}
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?>
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<h2>PHP Form Validation</h2>
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<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
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Name: <input type="text" name="name" value="<?php echo $name; ?>">
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<span class="error">* <?php echo $nameErr; ?></span>
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<br><br>
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E-mail: <input type="text" name="email" value="<?php echo $email; ?>">
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<span class="error">* <?php echo $emailErr; ?></span>
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<br><br>
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Website: <input type="text" name="website" value="<?php echo $website; ?>">
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<span class="error"><?php echo $websiteErr; ?></span>
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<br><br>
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Comment: <textarea name="comment" rows="5" cols="40"><?php echo $comment; ?></textarea>
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<br><br>
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<input type="submit" value="Submit" name="submit">
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<?php
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if ($_SERVER["REQUEST_METHOD"] == "POST") {
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echo "<h2>Your Input:</h2>";
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echo "Name: " . $name . "<br>";
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echo "Email: " . $email . "<br>";
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echo "Website: " . $website . "<br>";
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echo "Comment: " . $comment . "<br>";
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}
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?>
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</body>
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</html>

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