PHP执行shell脚本运行程序不产生core文件的方法

core file size     (blocks, -c) 0
data seg size      (kbytes, -d) unlimited
scheduling priority       (-e) 0
file size        (blocks, -f) unlimited
pending signals         (-i) 127364
max locked memory    (kbytes, -l) 64
max memory size     (kbytes, -m) unlimited
open files           (-n) 4096
pipe size      (512 bytes, -p) 8
POSIX message queues   (bytes, -q) 819200
real-time priority       (-r) 0
stack size       (kbytes, -s) 10240
cpu time        (seconds, -t) unlimited
max user processes       (-u) 127364
virtual memory     (kbytes, -v) unlimited
file locks           (-x) unlimited