Create a fifo special file (a named pipe)

# posix_mkfifo

(PHP 4, PHP 5, PHP 7, PHP 8)

posix_mkfifo — Create a fifo special file (a named pipe)

### 说明

function posix_mkfifo(string `$filename`, int `$permissions`): bool

posix_mkfifo() creates a special `FIFO` file which exists in the file system and acts as a bidirectional communication endpoint for processes.

### 参数

`filename`

  Path to the `FIFO` file.

`permissions`

  The second parameter `permissions` has to be given in octal notation (e.g. 0644). The permission of the newly created `FIFO` also depends on the setting of the current umask(). The permissions of the created file are (mode & ~umask).

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

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