(PHP 4 >= 4.1.0, PHP 5, PHP 7)
pcntl_wifstopped — Checks whether the child process is currently stopped
pcntl_wifstopped ( int $status ) : bool
Checks whether the child process which caused the return is currently stopped; this is only possible if the call to pcntl_waitpid() was done using the option WUNTRACED.
status
The status parameter is the status parameter supplied to a successful call to pcntl_waitpid().
Returns true if the child process which caused the return is currently stopped, false otherwise.
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https://www.php.net/manual/en/function.pcntl-wifstopped.php