Use PHP to build your own stable and reliable daemon

Build a stable and reliable PHP daemon

what

##● pcntl_fork

● Process/Process Group/Group Long process/session

●Standard input/output/error

why

how

You need to install the pcntl extension to use it

● Background running

if ($pid=pcntl_fork ()) exit (0);// is the parent process, end the parent process , the child process continues

●Leave the control terminal, log in to the session and process group

posix_setsid ();//The child process upgrades the group leader process, and leaves the original session/terminal

● Prohibit the process from reopening the control terminal

if ($pid=pcntl_fork ()) exit (0);//End the first child process and the second child process continues (the second child process is no longer a session Team leader)

● Close the open file descriptor

fclose (STDIN), fclose (STDOUT), fclose (STDERR) // Close standard input and output and error display.

● Change the current working directory

chdir("/")

● Reset the file creation mask

umask (0);//Prevent Inherit the mask left by the parent

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