# streamWrapper::stream_cast

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

streamWrapper::stream_cast — Retrieve the underlying resource

### 说明

public streamWrapper::stream_cast(int `$cast_as`): resource|false

This method is called in response to stream_select().

### 参数

`cast_as`

  Can be `STREAM_CAST_FOR_SELECT` when stream_select() is calling stream_cast() or `STREAM_CAST_AS_STREAM` when stream_cast() is called for other uses.

### 返回值

Should return the underlying stream resource used by the wrapper, or `false`.

### 参见

- stream_select() - Runs the equivalent of the select() system call on the given arrays of streams with a timeout specified by seconds and microseconds

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