Switch Default

A switch default, also called default, is the catch-all option in a switch() or a match() expression.

In a switch(), the default case may be stacked with other cases, to apply the same code. This is not possible with match().

<?php

switch($x) {
     case 'a':
     default:
             $a = 1;
             // fall through

     case 'b' :
             $a =2;
             break 1;
}

?>

Documentation

Related : Default, Switch, Match, Switch Case