问题描述

我对代码大吃一惊，其中的 GET 值(例如 $_GET['username'])并未作为函数的参数包含在内.

I am flabbergasted by the code, where the GET-values, such as $_GET['username'], are not included as parameters to functions.

什么时候需要包含 POST 和 GET 方法作为函数的参数?

When do you need to include POST and GET methods as parameters to functions?

推荐答案

什么时候需要包含 POST和 GET 方法作为参数功能?

When do you you need to include POST and GET methods as parameters to functions?

我会说从不":$_GET 和 $_POST 就是所谓的 superglobals:它们存在于整个脚本中；这意味着它们存在于函数/方法中.

I would say "never": $_GET and $_POST are what is called superglobals: they exists in the whole script; which means they exist inside functions/methods.

特别是，您不需要 global 关键字.

Especially, you don't need to you the global keyword for those.

尽管如此，依赖于您的函数/方法中的那些是一种非常糟糕的做法:您的函数/方法通常不应依赖于任何未作为参数传递的内容.

Still, relying on those in your functions/methods is quite a bad practice: your functions/methods should generally not depend on anything not passed as a parameter.

我的意思是；考虑这两个函数:

What I mean is; consider those two functions:

function check_login_password()
{
    $login = $_GET['login'];
    $password = $_GET['password'];
    // Work with $login and $password
}

和

/**
 * Check login and password
 *
 * @param $login string
 * @param $password string
 * @return boolean
 */
function check_login_password($login, $password)
{
    // Work with $login and $password
}

好的，对于第一个，您不必传递两个参数...但是该函数不会是独立的，并且在您必须检查几个登录名/密码的任何情况下都不起作用不是来自 $_GET.

OK, with the first one, you don't have to pass two parameters... But that function will not be independent and will not work in any situation where you'd have to check a couple of login/password that doesn't come from $_GET.

使用第二个函数，调用者负责传递正确的参数；这意味着它们可以来自您想要的任何地方:该功能将始终能够完成其工作.

With the second function, the caller is responsible for passing the right parameters; which mean they can come from wherever you want: the function will always be able to do its job.

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