在PHP中运行后台进程

Question

I did not want to do it using "shell, exec, etc"... Only with loop in php!

My understanding is in this case:

1. I have a form in page, on form submit, i will call on a PHP script which will run in Background.
2. Background process started and running ....running ....running .....running......
3. I want to got back process id with which Process id Background process started and previous background process running ....running ....running .....running ..........

I need to do this, and if possible a file where it executes a single code with loop until finish some line

Idea to project structure: click here

Answer 1

Many, many moons ago I wrote a PHP daemon which ran endlessly in the background on a client system that received instructions by polling a server and then performed various file I/O actions in response. For what it's worth, here's the relevant portion of the code that allowed this to run as a daemon, i.e. a background PHP process:

// (Note:
// The writeLog() function has been set up previously and is a 
// trivial function that adds timestamped lines into a logfile.)


$PIDfile='/tmp/myPID';           // Store process ID in this file

// If a deamon is already running, display its PID and abort:
if (file_exists ($PIDfile)) {
  if (is_readable ($PIDfile))
    die ($PIDfile . " already exists, PID=" . 
         file_get_contents ($PIDfile) . " (stale PID file?)
");
  else
  die ($PIDfile . " already exists, but is not readable.
");
}

// Set execution directives if we're running a PHP version prior to 5.3.0
// (ticks are deprecated as of PHP5.3.0 and will be removed from PHP6.0.0):
if (version_compare (PHP_VERSION, '5.3.0', '<'))
  declare (ticks = 1);

// Fork off the background (daemon) process:
$pid = pcntl_fork ();
if ($pid == -1) {
  die ("Fatal: unable to fork.
");
} elseif ($pid)
  exit ();                                      // We are the parent process

// If we arrive at this point, we are the child process.
// Detach from the controlling terminal:
if (posix_setsid () == -1)
  die ("Fatal: unable to detach from terminal.
");

// Register child PID:
$posid = posix_getpid ();
$fp = fopen ($PIDfile, "w");
fwrite ($fp, $posid);
fclose ($fp);

// Set up signal handlers:
pcntl_signal (SIGTERM, "SIGhandler");
pcntl_signal (SIGHUP, "SIGhandler");

// Log successful deamonization:
writeLog ("Daemon spawned, PID = " . $posid);

// Daemon payload code starts here:

while (1) {

  // Do all kinds of interesting stuff that does not require any user
  // input or screen output. In my case this consisted of file I/O and
  // communication with a server using various sockets.

}

// EOF

Hope this helps! Needless to say the above is a copy-and-paste of years old stuff from my code morgue and is supplied without any warranty or guarantee whatsoever. Enjoy!