Does it have to use a switch?
why not something like this:
if ( false === ( $value = get_transient( 'value' ) ) ) {
// this code runs when there is no valid transient set
} else {
// this code runs when there is a valid transient set
}
If the a transient returns a value it will not return true. It returns the value of the transient. If the transient is not set then it returns bool(false)
if you are using a switch it would be like this:
$transient = get_transient( foobar );
switch( $transient ) :
case false:
// transient not set
break;
default:
// transient didnt return false
break;
endswitch;
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