# SessionHandlerInterface::gc

(PHP 5 >= 5.4.0, PHP 7, PHP 8)

SessionHandlerInterface::gc — Cleanup old sessions

### 说明

public SessionHandlerInterface::gc(int `$max_lifetime`): int|false

Cleans up expired sessions. Called by session_start(), based on session.gc_divisor, session.gc_probability and session.gc_maxlifetime settings.

### 参数

`max_lifetime`

  Sessions that have not updated for the last `max_lifetime` seconds will be removed.

### 返回值

Returns the number of deleted sessions on success, 或者在失败时返回 `false`. Note this value is returned internally to PHP for processing.

### 更新日志

版本 | 说明
--- | ---
7.1.0 | Prior to this version, the function returned `true` on success.

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open