How can PHP developers effectively utilize the "exit();" function to control script execution without compromising the webpage layout?

When using the "exit();" function in PHP to control script execution, developers should ensure that it is used strategically to prevent any unwanted output that could affect the webpage layout. One way to do this is by placing the "exit();" function within conditional statements or at specific points in the code where it is necessary to halt execution without disrupting the layout.

// Example of using "exit();" function strategically to control script execution

// Check if user is not logged in, then exit script
if(!isset($_SESSION['user'])){
    exit("You must be logged in to access this page.");
}

// Other code continues here without affecting the webpage layout