# SessionUpdateTimestampHandlerInterface::validateId

(PHP 7, PHP 8)

SessionUpdateTimestampHandlerInterface::validateId — Validate ID

### 说明

public SessionUpdateTimestampHandlerInterface::validateId(string `$id`): bool

Validates a given session ID. A session ID is valid, if a session with that ID already exists. This function is automatically executed when a session is to be started, a session ID is supplied and session.use_strict_mode is enabled.

### 参数

`id`

  The session ID.

### 返回值

Returns `true` for valid ID, `false` otherwise. Note that this value is returned internally to PHP for processing.

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