(PHP 5 >= 5.3.4, PHP 7)
pcntl_get_last_error — Retrieve the error number set by the last pcntl function which failed
锟斤拷锟斤拷锟斤拷锟斤拷未锟斤拷写锟侥碉拷锟斤拷锟斤拷锟叫诧拷锟斤拷锟叫憋拷
锟剿猴拷锟斤拷没锟叫诧拷锟斤拷锟斤拷
Returns error code.