PHP Manual: proc_get

Return Values

An array of collected information on success, and FALSE on failure. The returned array contains the following elements:

element	type	description
command	string	The command string that was passed to proc_open().
pid	int	process id
running	bool	`TRUE` if the process is still running, `FALSE` if it has terminated.
signaled	bool	`TRUE` if the child process has been terminated by an uncaught signal. Always set to `FALSE` on Windows.
stopped	bool	`TRUE` if the child process has been stopped by a signal. Always set to `FALSE` on Windows.
exitcode	int	The exit code returned by the process (which is only meaningful if `running` is `FALSE`). Only first call of this function return real value, next calls return `-1`.
termsig	int	The number of the signal that caused the child process to terminate its execution (only meaningful if `signaled` is `TRUE`).
stopsig	int	The number of the signal that caused the child process to stop its execution (only meaningful if `stopped` is `TRUE`).