PHP default Keyword

Use default to handle unspecified cases in a switch block:

<?php
$a = 4;
switch($a) {
case 1: echo "One"; break;
case 2: echo "Two"; break;
case 3: echo "Three"; break;
default: echo "Many"; break;
}
?>

Definition and Usage

The default keyword is used in a switch block to specify which code to run when none of the case statements were matched by the expression.

The switch keyword.

Read more about the switch conditional in our PHP switch Statement Tutorial.