Use include to include "footer.php" in a page

                
                    <?php include 'footer.php';?>

                
                

Use include to include "menu.php" in a page

                
                    <?php include 'menu.php';?>
                
                

Use include to include "vars.php" in a page

                
                    <?php include 'vars.php';
                    echo "I have a $color $car.";
                    ?>
                
                

Use include to include a non-existing file

                
                    <?php include 'noFileExists.php';
                    echo "I have a $color $car.";
                    ?>
                
                

Use require to include a non-existing file

                
                    <?php require 'noFileExists.php';
                    echo "I have a $color $car.";
                    ?>