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我是新來的PHP和嘗試我的手從一個PHP登錄系統從this頁但有點混淆關於一段代碼。PHP用戶帳戶系統
下面顯示的代碼片段。
<?php
class UserPermissions {
\t const READ_POSTS = 1;
\t const POST_NEW_THREADS = 2;
\t const POST_NEW_REPLIES = 4;
\t const EDIT_OWN_POSTS = 8;
\t const EDIT_OTHERS_POSTS = 16;
\t const DELETE_OWN_POSTS = 32;
\t const DELETE_OTHERS_POSTS = 64;
\t const MOVE_THREADS = 128;
\t const SPLIT_THREADS = 256;
\t const MERGE_THREADS = 512;
\t const BAN_USERS = 1024;
\t const WARN_USERS = 2048;
\t const ACCESS_ADMIN_PANEL = 4096;
\t // And so on and so on
\t
\t protected $perms;
\t
\t function __construct($permissions) {
\t \t $this->perms = $permissions;
\t }
\t
\t function hasPermission($perm) {
\t \t return ($this->perms & $perm) === $perm;
\t }
}
?>主要焦點是hasPermision功能和返回值是如何計算的。
這是一個比較明智的比較。閱讀位和運算符（'＆'）。 –