Value listing

    Both Pure Enums and Backed Enums implement an internal interface named UnitEnum. UnitEnum includes a static method cases(). cases() returns a packed array of all defined Cases in the order of declaration.

    <?php

    Suit    ::cases();
    // Produces: [Suit::Hearts, Suit::Diamonds, Suit::Clubs, Suit::Spades]
    ?>

    Manually defining a cases() method on an Enum will result in a fatal error.

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    User Contributed Notes 3 notes

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    23
    theking2 at king dot ma
    1 year ago
    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
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    0
    Anonymous
    23 hours ago
    it is possible to get the values of cases as array using :

    array_column(MyListEnum::cases(), 'value')
    up
    -11
    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
    }
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