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pcntl_forkx — Create a child process using forkx(2)
The pcntl_forkx() function creates a child process
using the forkx(2) system call, which is available
on illumos and Solaris systems.
flagsflags parameter controls the behavior
of the fork. Pass 0 for default behavior or
FORK_NOSIGCHLD to prevent the
SIGCHLD signal from being sent to the parent
when the child terminates.
On success, the PID of the child process is returned in the
parent's thread of execution, and a 0 is returned
in the child's thread of execution. On failure, a -1
will be returned in the parent's context, no child process will be
created, and a PHP error is raised.