Enumerations

    (PHP 8 >= 8.1.0)

    Basic Enumerations

    Enumerations are a restricting layer on top of classes and class constants, intended to provide a way to define a closed set of possible values for a type.

    <?php
    enum Suit
    {
    case     Hearts;
    case     Diamonds;
    case     Clubs;
    case     Spades;
    }

    function     do_stuff(Suit $s)
    {
    // ...
    }

    do_stuff(Suit::Spades);
    ?>

    For a full discussion, see the Enumerations chapter.

    Casting

    If an enum is converted to an object, it is not modified. If an enum is converted to an array, an array with a single name key (for Pure enums) or an array with both name and value keys (for Backed enums) is created. All other cast types will result in an error.

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    User Contributed Notes 1 note

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    esdras-schonevald
    3 years ago
    https://gist.github.com/esdras-schonevald/71a6730e6191c5e9c053e2f65b839eec<?phpdeclare(strict_types=1);/** * This is a sample * How to use Enum to create a custom exception cases * PHP 8.1^ */enum MyExceptionCase {    case InvalidMethod;    case InvalidProperty;    case Timeout;}class MyException extends Exception {    function __construct(private MyExceptionCase $case){        match($case){            MyExceptionCase::InvalidMethod      =>    parent::__construct("Bad Request - Invalid Method", 400),            MyExceptionCase::InvalidProperty    =>    parent::__construct("Bad Request - Invalid Property", 400),            MyExceptionCase::Timeout            =>    parent::__construct("Bad Request - Timeout", 400)        };    }}// Testing my custom exception classtry {    throw new MyException(MyExceptionCase::InvalidMethod);} catch (MyException $myE) {    echo $myE->getMessage();  // Bad Request - Invalid Method}
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