<\/span><\/h2>\n1. Start the PHP session:<\/strong> Before we can add values to the session array, we need to start the PHP session using the session_start()<\/code> function at the beginning of each page where we want to use session variables.<\/p>\n2. Access the session array:<\/strong> After starting the session, we can access the session array using the $_SESSION<\/code> superglobal variable. This variable is an associative array that holds the session data.<\/p>\n3. Add a value to the session array:<\/strong> To add a value to the session array, simply assign a value to a specific key within the $_SESSION<\/code> variable. For example, to add a value “John” to a key “username”, we can use the following code:
\n“`php
\n$_SESSION[‘username’] = ‘John’;
\n“`<\/p>\n4. Retrieve the added value:<\/strong> Once the value is added to the session array, it can be retrieved on subsequent pages using the same $_SESSION<\/code> variable. For example, to retrieve the username, we can use:
\n“`php
\necho $_SESSION[‘username’];
\n“`<\/p>\n5. Modify session values:<\/strong> We can also modify the values within the session array by simply reassigning a new value to the desired key. For example, to change the username to “Jane”, we can use the following code:
\n“`php
\n$_SESSION[‘username’] = ‘Jane’;
\n“`<\/p>\n6. Unset session values:<\/strong> If we want to remove a specific value from the session array, we can use the unset()<\/code> function. For example, to remove the username, we can use the following code:
\n“`php
\nunset($_SESSION[‘username’]);
\n“`<\/p>\n7. Check if a session value exists:<\/strong> To determine if a specific session value exists, we can use the isset()<\/code> function. It returns true if the value is set and false otherwise. For example, to check if the username is set, we can use:
\n“`php
\nif(isset($_SESSION[‘username’])) {
\n \/\/ do something
\n}
\n“`<\/p>\n