(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
pcntl_wexitstatus — Returns the return code of a terminated child
   Returns the return code of a terminated child.  This function is
   only useful if pcntl_wifexited() returned
   true.
  
   Returns the return code.
   If the functionality is not supported by the OS, false is returned.
  
