Gets class constants

# ReflectionClass::getReflectionConstants

(PHP 7 >= 7.1.0, PHP 8)

ReflectionClass::getReflectionConstants — Gets class constants

### 说明

public function ReflectionClass::getReflectionConstants(?int `$filter` = `null`): array

Retrieves reflected constants.

### 参数

`filter`

  The optional filter, for filtering desired constant visibilities. It's configured using the ReflectionClassConstant constants, and defaults to all constant visibilities.

### 返回值

An array of ReflectionClassConstant objects.

### 更新日志

版本 | 说明
--- | ---
8.0.0 | `filter` has been added.

### 示例

示例 #1 Basic ReflectionClass::getReflectionConstants() example

    <?php
    class Foo {
        public    const FOO  = 1;
        protected const BAR  = 2;
        private   const BAZ  = 3;
    }

    $foo = new Foo();

    $reflect = new ReflectionClass($foo);
    $consts  = $reflect->getReflectionConstants();

    foreach ($consts as $const) {
        print $const->getName() . "\n";
    }

    var_dump($consts);

    ?>

以上示例的输出类似于：

    FOO
    BAR
    BAZ
    array(3) {
      [0]=>
      object(ReflectionClassConstant)#3 (2) {
        ["name"]=>
        string(3) "FOO"
        ["class"]=>
        string(3) "Foo"
      }
      [1]=>
      object(ReflectionClassConstant)#4 (2) {
        ["name"]=>
        string(3) "BAR"
        ["class"]=>
        string(3) "Foo"
      }
      [2]=>
      object(ReflectionClassConstant)#5 (2) {
        ["name"]=>
        string(3) "BAZ"
        ["class"]=>
        string(3) "Foo"
      }
    }

### 参见

- ReflectionClass::getReflectionConstant() - Gets a ReflectionClassConstant for a class's constant
- ReflectionClassConstant

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