public property PurgeInvalidation::$expression_can_be_empty in Purge 8.3

Can expressions be empty.

When expression_required = TRUE, this determines whether a string expression can be equal to "" (empty string). If FALSE, this invalidation type can not be instantiated with empty expression strings.

Type: bool

File

src/Annotation/PurgeInvalidation.php, line 68

Class

PurgeInvalidation

Defines a PurgeInvalidation annotation object.

Namespace

Drupal\purge\Annotation

Code

public $expression_can_be_empty = FALSE;