As ::cases() creates a Iteratable it is possible to use it in a foreach loop. In combination with value backed enum this can result in very compact and very readable code:
<?php
/** Content Security Policy directives */
enum CspDirective: String {
case Default = "default-src";
case Image = "img-src";
case Font = "font-src";
case Script = "script-src";
case Style = "style-src";
}
/** list all CSP directives */
foreach( CspSource::cases() as $directive ) {
echo $directive-> value . PHP_EOL;
}
?>
Which results in:
default-src
img-src
font-src
script-src
style-src
Liste de valeurs
Les Enums pures et les Enums soutenues implémentent toute deux une interface interne nommée
UnitEnum. UnitEnum comprend une méthode statique
cases(). cases() renvoie un tableau compact de
tous les cas définis dans l'ordre de leur déclaration.
<?php
Suit::cases();
// Produces: [Suit::Hearts, Suit::Diamonds, Suit::Clubs, Suit::Spades]
?>La définition manuelle d'une méthode cases() sur un Enum entraînera une erreur fatale.
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User Contributed Notes 2 notes
theking2 at king dot ma ¶
2 years ago
ratsimbasitraka at gmail dot com ¶
1 year ago
enum Priority {
case Left;
case Right;
}
// Does not work as default parameter
public function selectPriorities(array $priorities = Priority::cases()) {
Priority::cases() // works here
}
