下面是一个github库，用于在php中处理类型安全的枚举:

这个库处理类生成、类缓存，并实现了Type Safe Enumeration设计模式，使用几个辅助方法来处理枚举，比如为枚举排序检索序号，或为枚举组合检索二进制值。

生成的代码使用一个普通的旧php模板文件，该文件也是可配置的，因此您可以提供自己的模板。

它是由phpunit覆盖的完整测试。

Php-enums在github (feel free to fork)

用法:(@参见Usage .php或单元测试了解更多细节)

<?php
//require the library
require_once __DIR__ . '/src/Enum.func.php';

//if you don't have a cache directory, create one
@mkdir(__DIR__ . '/cache');
EnumGenerator::setDefaultCachedClassesDir(__DIR__ . '/cache');

//Class definition is evaluated on the fly:
Enum('FruitsEnum', array('apple' , 'orange' , 'rasberry' , 'bannana'));

//Class definition is cached in the cache directory for later usage:
Enum('CachedFruitsEnum', array('apple' , 'orange' , 'rasberry' , 'bannana'), '\my\company\name\space', true);

echo 'FruitsEnum::APPLE() == FruitsEnum::APPLE(): ';
var_dump(FruitsEnum::APPLE() == FruitsEnum::APPLE()) . "\n";

echo 'FruitsEnum::APPLE() == FruitsEnum::ORANGE(): ';
var_dump(FruitsEnum::APPLE() == FruitsEnum::ORANGE()) . "\n";

echo 'FruitsEnum::APPLE() instanceof Enum: ';
var_dump(FruitsEnum::APPLE() instanceof Enum) . "\n";

echo 'FruitsEnum::APPLE() instanceof FruitsEnum: ';
var_dump(FruitsEnum::APPLE() instanceof FruitsEnum) . "\n";

echo "->getName()\n";
foreach (FruitsEnum::iterator() as $enum)
{
  echo "  " . $enum->getName() . "\n";
}

echo "->getValue()\n";
foreach (FruitsEnum::iterator() as $enum)
{
  echo "  " . $enum->getValue() . "\n";
}

echo "->getOrdinal()\n";
foreach (CachedFruitsEnum::iterator() as $enum)
{
  echo "  " . $enum->getOrdinal() . "\n";
}

echo "->getBinary()\n";
foreach (CachedFruitsEnum::iterator() as $enum)
{
  echo "  " . $enum->getBinary() . "\n";
}

输出:

FruitsEnum::APPLE() == FruitsEnum::APPLE(): bool(true)
FruitsEnum::APPLE() == FruitsEnum::ORANGE(): bool(false)
FruitsEnum::APPLE() instanceof Enum: bool(true)
FruitsEnum::APPLE() instanceof FruitsEnum: bool(true)
->getName()
  APPLE
  ORANGE
  RASBERRY
  BANNANA
->getValue()
  apple
  orange
  rasberry
  bannana
->getValue() when values have been specified
  pig
  dog
  cat
  bird
->getOrdinal()
  1
  2
  3
  4
->getBinary()
  1
  2
  4
  8

我所见过的PHP中枚举最常见的解决方案是创建一个通用枚举类，然后扩展它。你可以看看这个。

更新:或者，我从phpclasses.org找到了这个。

我已经开始使用下面的方法，因为它使我能够对函数参数具有类型安全，在NetBeans中自动完成和良好的性能。我不太喜欢的一件事是你必须调用[扩展类名]::enumerate();在定义类之后。

abstract class Enum {

    private $_value;

    protected function __construct($value) {
        $this->_value = $value;
    }

    public function __toString() {
        return (string) $this->_value;
    }

    public static function enumerate() {
        $class = get_called_class();
        $ref = new ReflectionClass($class);
        $statics = $ref->getStaticProperties();
        foreach ($statics as $name => $value) {
            $ref->setStaticPropertyValue($name, new $class($value));
        }
    }
}

class DaysOfWeek extends Enum {
    public static $MONDAY = 0;
    public static $SUNDAY = 1;
    // etc.
}
DaysOfWeek::enumerate();

function isMonday(DaysOfWeek $d) {
    if ($d == DaysOfWeek::$MONDAY) {
        return true;
    } else {
        return false;
    }
}

$day = DaysOfWeek::$MONDAY;
echo (isMonday($day) ? "bummer it's monday" : "Yay! it's not monday");

我只是创建了一个库，希望它能完成这项工作。它可以在任何PHP项目中独立使用，并且有一些Laravel的好东西可以让生活变得更简单。我在生产项目中使用它们。

https://github.com/Kwaadpepper/enum

如果你喜欢或不喜欢，不要犹豫提供反馈。 它可以被打印出来，并序列化为JSON。它的定义很简单。

用法非常简单:

$enum = BasicEnum::someValue();
echo $enum->equals(BasicEnum::someValue()) ? 'true' : 'false'; // true
echo $enum->value; // 'someValue' or the value you have defined
echo $enum->label; // 'someValue' or the label you have defined
echo $enum; // 'someValue' or the value you have defined
echo json_encode($enum); // {"label": "someValue", "value: "someValue" }

枚举定义非常简单(值和标签方法是可选的)

/**
 * @method static self post()
 * @method static self about()
 * @method static self contact()
 */
class PostType extends BaseEnum
{
    protected static function values(): array
    {
        return [
            'post' => 0,
            'about' => 1,
            'contact' => 2
        ];
    }

    protected static function labels(): array
    {
        return [
            'post' => 'Regular posts',
            'about' => 'The about page',
            'contact' => 'The contact page'
        ];
    }
}

类常量呢?

<?php

class YourClass
{
    const SOME_CONSTANT = 1;

    public function echoConstant()
    {
        echo self::SOME_CONSTANT;
    }
}

echo YourClass::SOME_CONSTANT;

$c = new YourClass;
$c->echoConstant();

基于此要点，所有枚举的基类:

abstract class Enum {
    protected $val;

    protected function __construct($arg) {
        $this->val = $arg;
    }

    public function __toString() {
        return $this->val;
    }

    public function __set($arg1, $arg2) {
        throw new Exception("enum does not have property");
    }

    public function __get($arg1) {
        throw new Exception("enum does not have property");
    }

    // not really needed
    public function __call($arg1, $arg2) {
        throw new Exception("enum does not have method");
    }

    // not really needed
    static public function __callStatic($arg1, $arg2) {
        throw new Exception("enum does not have static method");
    }
}

你的枚举:

final class MyEnum extends Enum {
    static public function val1() {
        return new self("val1");
    }

    static public function val2() {
        return new self("val2");
    }

    static public function val3() {
        return new self("val3");
    }
}

测试:

$a = MyEnum::val1();
echo "1.the enum value is '$a'\n";

function consumeMyEnum(MyEnum $arg) {
    return "2.the return value is '$arg'\n";
}

echo consumeMyEnum($a);
$version = explode(".", PHP_VERSION);
if ($version[0] >= 7) {
    try {
        echo consumeMyEnum("val1");
    } catch (TypeError $e) {
        echo "3.passing argument error happens (PHP 7.0 and above)\n";
    }
}

echo ($a == MyEnum::val1()) ? "4.same\n" : "4.different\n";
echo ($a == MyEnum::val2()) ? "5.same\n" : "5.different\n";

$b = MyEnum::val1();
echo ($a == $b)  ? "6.same\n" : "6.different\n";
echo ($a === $b) ? "7.same\n" : "7.different\n";

$c = MyEnum::val2();
echo ($a == $c)  ? "8.same\n" : "8.different\n";
echo ($a === $c) ? "9.same\n" : "9.different\n";

switch ($c) {
    case MyEnum::val1(): echo "10.case of 1st\n"; break;
    case MyEnum::val2(): echo "11.case of 2nd\n"; break;
    case MyEnum::val3(): echo "12.case of 3rd\n"; break;
}

try {
    $a->prop = 10;
} catch (Exception $e) {
    echo "13.set property error happens\n";
}

try {
    echo $a->prop;
} catch (Exception $e) {
    echo "14.get property error happens\n";
}

try {
    echo $a->meth();
} catch (Exception $e) {
    echo "15.method call error happens\n";
}

try {
    echo MyEnum::meth();
} catch (Exception $e) {
    echo "16.static method call error happens\n";
}

class Ordinary {}
echo $a instanceof MyEnum   ? "17.MyEnum instance\n"   : "17.not MyEnum instance\n";
echo $a instanceof Enum     ? "18.Enum instance\n"     : "18.not Enum instance\n";
echo $a instanceof Ordinary ? "19.Ordinary instance\n" : "19.not Ordinary instance\n";

在网上试试:沙盒