Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
317 views
in Technique[技术] by (71.8m points)

php function variable scope

I was wondering if i have a function like this:

function isAdmin ($user_id) {

    $admin_arr = array(1, 2);

    foreach ($admin_arr as $value) {

        if ($value == $user_id) {
            return true;
        }
    }

    return false;
}

Could i make an array outside of that function as a global array and use it inside the function without sending it through as a parameter, also instead declaring a new admin array inside the function as i just did above? How would i do this?

Regards, Alexander

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

To answer literal question:

// Global variable
$admin_arr = array(1, 2);

function isAdmin ($user_id) {

    // Declare global
    global $admin_arr;

    foreach ($admin_arr as $value) {

        if ($value == $user_id) {
            return true;
        }
    }

return false;
}

Documentation here: http://php.net/manual/en/language.variables.scope.php

To answer the REAL question: Avoid global at all costs. You are introducing a plethora of error prone code into your application. Relying on global variables is entering a world of pain and makes your functions less useful.

Avoid it unless you absolutely see no other way.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...