PHP 4, PHP 5, PHP 7, PHP 8
posix_isatty - Determine if a file descriptor is an interactive terminal

posix_isatty( resource|int$file_descriptor ): bool

Determines if the file descriptor file_descriptor refers to a valid terminal type device.



The file descriptor, which is expected to be either a file resource or an int. An int will be assumed to be a file descriptor that can be passed directly to the underlying system call.

In almost all cases, you will want to provide a file resource.

Return Values

Returns true if file_descriptor is an open descriptor connected to a terminal and false otherwise.

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