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 2 notes

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    23
    theking2 at king dot ma
    2 years 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
    anhaia dot gabriel at gmail dot com
    5 days ago
    If you want to get all the values of the Enum in a list of `string`, you might do something like this:

    <?php

    enum MyEnum: string
    {
    case     OPTION_A = 'option_a';
    case     OPTION_B = 'option_b';
    case     OPTION_C = 'option_c';

    public static function     values(): array
    {
    return     array_map(fn ($case) => $case->value, self::cases());
    }
    }

    ?>
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