在PHP和JavaScript之间共享常量 [英] Share Constants Between PHP and JavaScript

问题描述

可能重复：

将PHP字符串传递给Javascript变量（并转义换行符）

我正在开发的PHP应用程序中有几个常量。我已经定义了一个Constants类，并将常量定义为const VAR_NAME = value;在这堂课上。我想在JavaScript和PHP代码之间共享这些常量。是否有DRY（不要重复自己）机制来共享它们？

I have several constants in a PHP application I'm developing. I've defined a Constants class and the defined the constants as const VAR_NAME = value; in this class. I would like to share these constants between my JavaScript and PHP code. Is there a DRY (Don't Repeat Yourself) mechanism to share them?

class Constants {
    const RESOURCE_TYPE_REGSITER = 2;
    const RESOURCE_TYPE_INFO = 1;
}

推荐答案

我会用 json_encode 。您必须首先将类转换为关联数组。

I would use json_encode. You will have to convert the class to an associative array first.

$constants = array("RESOURCE_TYPE_REGISTER"=>2, "RESOURCE_TYPE_INFO"=>2);
echo json_encode($constants);

如果您更喜欢使用类，也可以使用反射将类转换为关联数组。

You could also use reflection to convert the class to an associative array if you would prefer to use a class.

function get_class_consts($class_name)
{
    $c = new ReflectionClass($class_name);
    return ($c->getConstants());
}

class Constants {
    const RESOURCE_TYPE_REGSITER = 2;
    const RESOURCE_TYPE_INFO = 1;
}

echo json_encode(get_class_consts("Constants"));

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