# stream_isatty

(PHP 7 >= 7.2.0, PHP 8)

stream_isatty — Check if a stream is a TTY

### 说明

stream_isatty(resource `$stream`): bool

Determines if stream `stream` refers to a valid terminal type device. This is a more portable version of posix_isatty(), since it works on Windows systems too.

### 参数

`stream`

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 示例

示例 #1 stream_isatty() example

This command can be used to determine if a standard output / standard error stream is redirected to a file.

    php -r "var_export(stream_isatty(STDERR));"

以上示例的输出类似于：

true

    php -r "var_export(stream_isatty(STDERR));" 2>output.txt

以上示例的输出类似于：

false
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