php man page for ignore_user_abort

IGNORE_USER_ABORT(3)							 1						      IGNORE_USER_ABORT(3)

ignore_user_abort - Set whether a client disconnect should abort script execution

SYNOPSIS
       int ignore_user_abort ([string  $value])

DESCRIPTION
	Sets whether a client disconnect should cause a script to be aborted.

	When running PHP as a command line script, and the script's tty goes away without the script being terminated then the script will die the
       next time it tries to write anything, unless $value is set to TRUE

PARAMETERS
	      o $value
		- If set, this function will set the ignore_user_abort ini setting to the given $value. If not, this function will only return the
		previous setting without changing it.

RETURN VALUES
	Returns the previous setting, as an integer.

EXAMPLES
       Example #1

	      A ignore_user_abort(3) example

	      <?php
	      // Ignore user aborts and allow the script
	      // to run forever
	      ignore_user_abort(true);
	      set_time_limit(0);

	      echo 'Testing connection handling in PHP';

	      // Run a pointless loop that sometime
	      // hopefully will make us click away from
	      // page or click the "Stop" button.
	      while(1)
	      {
		  // Did the connection fail?
		  if(connection_status() != CONNECTION_NORMAL)
		  {
		      break;
		  }

		  // Sleep for 10 seconds
		  sleep(10);
	      }

	      // If this is reached, then the 'break'
	      // was triggered from inside the while loop

	      // So here we can log, or perform any other tasks
	      // we need without actually being dependent on the
	      // browser.
	      ?>

NOTES
	PHP  will  not detect that the user has aborted the connection until an attempt is made to send information to the client. Simply using an
       echo statement does not guarantee that information is sent, see flush(3).

SEE ALSO
       connection_aborted(3), connection_status(3), Connection Handling for a complete description of connection handling in PHP. .

PHP Documentation Group 												      IGNORE_USER_ABORT(3)