PHP数组在权限控制和用户管理中的应用方法和技巧

// 定义关联数组，键为用户名，值为对应的权限角色
$permissions = array(
  'admin' => 'admin',
  'user' => 'user',
  'guest' => 'guest'
);

// 示例用户
$user = 'admin';

// 判断用户权限
if (array_key_exists($user, $permissions)) {
  echo "用户{$user}拥有权限角色: " . $permissions[$user];
} else {
  echo "用户{$user}不存在";
}

// 定义多维数组，第一维为用户，第二维为模块或操作
$permissions = array(
  'admin' => array(
    'module1' => true,
    'module2' => true,
    'module3' => true
  ),
  'user' => array(
    'module1' => true,
    'module2' => false,
    'module3' => true
  ),
  'guest' => array(
    'module1' => false,
    'module2' => false,
    'module3' => false
  )
);

// 示例用户和模块
$user = 'admin';
$module = 'module2';

// 判断用户是否拥有权限
if (isset($permissions[$user][$module]) && $permissions[$user][$module]) {
  echo "用户{$user}拥有访问模块{$module}的权限";
} else {
  echo "用户{$user}没有访问模块{$module}的权限";
}

// 定义索引数组，存储用户信息
$users = array(
  array('id' => 1, 'name' => 'John', 'email' => 'john@example.com'),
  array('id' => 2, 'name' => 'Jane', 'email' => 'jane@example.com'),
  array('id' => 3, 'name' => 'Tom', 'email' => 'tom@example.com')
);

// 遍历用户数组
foreach ($users as $user) {
  echo "用户ID: " . $user['id'] . "<br>";
  echo "用户名: " . $user['name'] . "<br>";
  echo "邮箱: " . $user['email'] . "<br><br>";
}

// 定义关联数组，存储用户信息
$user = array(
  'id' => 1,
  'name' => 'John',
  'email' => 'john@example.com',
  'address' => array(
    'street' => '123 Main St',
    'city' => 'New York',
    'state' => 'NY',
    'zipcode' => '10001'
  )
);

// 输出用户信息
echo "用户ID: " . $user['id'] . "<br>";
echo "用户名: " . $user['name'] . "<br>";
echo "邮箱: " . $user['email'] . "<br>";
echo "地址: " . $user['address']['street'] . ", " . $user['address']['city'] . ", " . $user['address']['state'] . " " . $user['address']['zipcode'];