Start a session

                
                    <?php
                    // Start the session
                    session_start();
                    
                    
                    // Set session variables
                    $_SESSION["favcolor"] = "green";
                    $_SESSION["favanimal"] = "cat";
                    echo "Session variables are set.";
                    ?>
                    
                
                

Get session variable values

                
                    <?php
                    session_start();
                    
                    
                    // Echo session variables that were set on previous page
                    echo "Favorite color is " . $_SESSION["favcolor"] . ".<br>";
                    echo "Favorite animal is " . $_SESSION["favanimal"] . ".";
                    ?>
                
                

Get all session variable values

                
                    <?php
                    session_start();
                    
                    
                    print_r($_SESSION);
                    ?>
                    
                  
                
                

Modify a session variable

                
                    <?php
                    session_start();
                    
                    
                    // to change a session variable, just overwrite it
                    $_SESSION["favcolor"] = "yellow";
                    print_r($_SESSION);
                    ?>
                
                

Destroy a session

                
                    <?php
                    session_start();
                    
                    
                    // remove all session variables
                    session_unset();
                    
                    // destroy the session
                    session_destroy();
                    
                    echo "All session variables are now removed, and the session is destroyed."
                    ?>