php如何实现用户权限位运算控制_php权限标识设计与位与位或检查技巧

$permission = 0;
$permission |= 1; // 添加查看
$permission |= 2; // 添加编辑
$permission |= 8; // 添加新增
// 最终 $permission = 11

function hasPrivilege($userPerm, $needPerm) {
    return ($userPerm & $needPerm) === $needPerm;
}
<p>// 示例：用户权限为11（即拥有 VIEW|EDIT|ADD）
$userPerm = 11;</p><p>var_dump(hasPrivilege($userPerm, 1)); // true  - 可查看
var_dump(hasPrivilege($userPerm, 2)); // true  - 可编辑
var_dump(hasPrivilege($userPerm, 4)); // false - 不可删除
var_dump(hasPrivilege($userPerm, 8)); // true  - 可新增</p>

class Privileges
{
    const VIEW     = 1 << 0; // 1
    const EDIT     = 1 << 1; // 2
    const DELETE   = 1 << 2; // 4
    const ADD      = 1 << 3; // 8
    const EXPORT   = 1 << 4; // 16
<pre class='brush:php;toolbar:false;'>public static function getAll()
{
    return self::VIEW | self::EDIT | self::DELETE | self::ADD | self::EXPORT;
}

$perm = 0;
$perm |= Privileges::VIEW;
$perm |= Privileges::ADD;
<p>if ($perm & Privileges::VIEW) { ... }</p>