Session操作 - TP5源代码阅读

public static function init(array $config = [])
    {
 if (empty($config)) {
     $config = Config::get('session');
 }
 // 记录初始化信息
 App::$debug && Log::record('[ SESSION ] INIT ' . var_export($config, true), 'info');
 $isDoStart = false;
 if (isset($config['use_trans_sid'])) {
     ini_set('session.use_trans_sid', $config['use_trans_sid'] ? 1 : 0);
 }

 // 启动session
 if (!empty($config['auto_start']) && PHP_SESSION_ACTIVE != session_status()) {
     ini_set('session.auto_start', 0);
     $isDoStart = true;
 }

 if (isset($config['prefix'])) {
     self::$prefix = $config['prefix'];
 }
 if (isset($config['var_session_id']) && isset($_REQUEST[$config['var_session_id']])) {
     session_id($_REQUEST[$config['var_session_id']]);
 } elseif (isset($config['id']) && !empty($config['id'])) {
     session_id($config['id']);
 }
 if (isset($config['name'])) {
     session_name($config['name']);
 }
 if (isset($config['path'])) {
     session_save_path($config['path']);
 }
 if (isset($config['domain'])) {
     ini_set('session.cookie_domain', $config['domain']);
 }
 if (isset($config['expire'])) {
     ini_set('session.gc_maxlifetime', $config['expire']);
     ini_set('session.cookie_lifetime', $config['expire']);
 }

 if (isset($config['use_cookies'])) {
     ini_set('session.use_cookies', $config['use_cookies'] ? 1 : 0);
 }
 if (isset($config['cache_limiter'])) {
     session_cache_limiter($config['cache_limiter']);
 }
 if (isset($config['cache_expire'])) {
     session_cache_expire($config['cache_expire']);
 }
 if (!empty($config['type'])) {
     // 读取session驱动
     $class = false !== strpos($config['type'], '\') ? $config['type'] : '\think\session\driver\' . ucwords($config['type']);

     // 检查驱动类
     if (!class_exists($class) || !session_set_save_handler(new $class($config))) {
  throw new ClassNotFoundException('error session handler:' . $class, $class);
     }
 }
 if ($isDoStart) {
     session_start();
     self::$init = true;
 } else {
     self::$init = false;
 }
    }

>根据配置，初始化session存储机制。



# 2 Session操作

## 2-1 session管理

### Session::boot()
>>session自动启动

public static function boot()
    {
 if (is_null(self::$init)) {
     self::init();
 } elseif (false === self::$init) {
     session_start();
     self::$init = true;
 }
    }


### Session::start()
>>启动session

public static function start()
    {
 session_start();
 self::$init = true;
    }


### Session::pause()
>>暂停session

public static function pause()
    {
 // 暂停session
 session_write_close();
 self::$init = false;
    }


### Session::regenerate()
>>重新生成session_id

private static function regenerate($delete = false)
    {
 session_regenerate_id($delete);
    }

    
## 2-2 前缀操作

### Session::prefix()
>>设置session存储名称前缀

public static function prefix($prefix = '')
    {
 if (empty($prefix) && null !== $prefix) {
     return self::$prefix;
 } else {
     self::$prefix = $prefix;
 }
    }


## 2-3 数据操作

### Session::set()
>>session存储


public static function set($name, $value = '', $prefix = null)
    {
 empty(self::$init) && self::boot();

 $prefix = !is_null($prefix) ? $prefix : self::$prefix;
 if (strpos($name, '.')) {
     // 二维数组赋值
     list($name1, $name2) = explode('.', $name);
     if ($prefix) {
  $_SESSION[$prefix][$name1][$name2] = $value;
     } else {
  $_SESSION[$name1][$name2] = $value;
     }
 } elseif ($prefix) {
     $_SESSION[$prefix][$name] = $value;
 } else {
     $_SESSION[$name] = $value;
 }
    }

### Session::get()

>>session读取

public static function set($name, $value = '', $prefix = null)
    {
 empty(self::$init) && self::boot();

 $prefix = !is_null($prefix) ? $prefix : self::$prefix;
 if (strpos($name, '.')) {
     // 二维数组赋值
     list($name1, $name2) = explode('.', $name);
     if ($prefix) {
  $_SESSION[$prefix][$name1][$name2] = $value;
     } else {
  $_SESSION[$name1][$name2] = $value;
     }
 } elseif ($prefix) {
     $_SESSION[$prefix][$name] = $value;
 } else {
     $_SESSION[$name] = $value;
 }
    }


### Session::pull()
>>session读取并删除

 public static function pull($name, $prefix = null)
    {
 $result = self::get($name, $prefix);
 if ($result) {
     self::delete($name, $prefix);
     return $result;
 } else {
     return null;
 }
    }


### Session::delete()
>>session删除

public static function delete($name, $prefix = null)
    {
 empty(self::$init) && self::boot();
 $prefix = !is_null($prefix) ? $prefix : self::$prefix;
 if (strpos($name, '.')) {
     list($name1, $name2) = explode('.', $name);
     if ($prefix) {
  unset($_SESSION[$prefix][$name1][$name2]);
     } else {
  unset($_SESSION[$name1][$name2]);
     }
 } else {
     if ($prefix) {
  unset($_SESSION[$prefix][$name]);
     } else {
  unset($_SESSION[$name]);
     }
 }
    }


### Session::clear()
>>清空session数据

public static function delete($name, $prefix = null)
    {
 empty(self::$init) && self::boot();
 $prefix = !is_null($prefix) ? $prefix : self::$prefix;
 if (strpos($name, '.')) {
     list($name1, $name2) = explode('.', $name);
     if ($prefix) {
  unset($_SESSION[$prefix][$name1][$name2]);
     } else {
  unset($_SESSION[$name1][$name2]);
     }
 } else {
     if ($prefix) {
  unset($_SESSION[$prefix][$name]);
     } else {
  unset($_SESSION[$name]);
     }
 }
    }


### Session::has()
>>检测session数据

public static function has($name, $prefix = null)
    {
 empty(self::$init) && self::boot();
 $prefix = !is_null($prefix) ? $prefix : self::$prefix;
 if (strpos($name, '.')) {
     // 支持数组
     list($name1, $name2) = explode('.', $name);
     return $prefix ? isset($_SESSION[$prefix][$name1][$name2]) : isset($_SESSION[$name1][$name2]);
 } else {
     return $prefix ? isset($_SESSION[$prefix][$name]) : isset($_SESSION[$name]);
 }
    }



# 3 Session存储(Redis)

>>session内置了3种存储机制。Redis/Memcache/Memcached

### $redissession->__construct()
### $redissession->open()
### $redissession->close()
### $redissession->read()
### $redissession->write()
### $redissession->destroy()