How can the EVA principle be applied in PHP to customize output based on user input?

To apply the EVA principle in PHP to customize output based on user input, you can use conditional statements to check the user input and adjust the output accordingly. This can be achieved by using if-else statements or switch cases to handle different scenarios based on the user input.

$userInput = $_GET['input'];

if ($userInput == 'A') {
    echo 'Output A';
} elseif ($userInput == 'B') {
    echo 'Output B';
} else {
    echo 'Default Output';
}