# max_request
设置worker进程的最大任务数。一个worker进程在处理完超过此数值的任务后将自动退出。这个参数是为了防止PHP进程内存溢出。
> 如果不希望进程自动退出可以设置为0
当worker进程内发生致命错误或者人工执行exit时，进程会自动退出。主进程会重新启动一个新的worker进程来处理任务
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