What are some potential pitfalls when using a switch structure in PHP to handle multiple variable values?

One potential pitfall when using a switch structure in PHP to handle multiple variable values is forgetting to include a default case. If a value does not match any of the cases, the switch statement will not execute any code, leading to unexpected behavior. To solve this issue, always include a default case to handle any unexpected values.

switch($variable) {
    case 'value1':
        // code for value1
        break;
    case 'value2':
        // code for value2
        break;
    default:
        // default case for handling unexpected values
        break;
}