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
Listagem de valores
Tanto Pure Enums quanto Backed Enums implementam uma interface interna chamada
UnitEnum. UnitEnum inclui um método estático
cases(). cases() retorna um array embalado com
todos os Casos definidos na ordem de declaração.
<?php
Naipe::cases();
// Produz: [Naipe::Copas, Naipe::Ouros, Naipe::Paus, Naipe::Espadas]
?>Definir manualmente um método cases() em uma Enum resultará em um erro fatal.
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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
}
