README

Daemon class provides helpers for starting and killing daemonized processes.

Disclaimer: This package is forked version of this. Main goal of this fork/rewrite is provide a package responsible only for one thing. If you are looking for console inputs, colors etc, see CLIMate or Symfony console.

Installation

The prefered way to install Daemon is through composer; the minimum composer.json configuration is:

{
    "require": {
        "timmit/daemon": "~1.0.0"
    }
}

PHP 5.4 is required. This library is developed on and is meant to be used on POSIX systems with the posix, pcntl, and sockets extensions loaded.

Api

Daemon::isRunning($pid)

Tests if a daemon is currently running or not. Returns true or false:

<?php
use TiMMiT\Daemon;
if (Daemon::isRunning('/path/to/process.pid')) {
    echo "daemon is running.\n";
} else {
    echo "daemon is not running.\n";
}

Daemon::work(array $options, callable $callable)

Daemon a $callable callable object. The $options key-value array must contain pid as the path to the PID file:

<?php
use TiMMiT\Daemon;
if (Daemon::isRunning('/path/to/process.pid')) {
    echo "daemon is already running.\n";
} else {
    Daemon::work(array(
            'pid'    => '/path/to/process.pid', // required
            'stdin'  => '/dev/null',            // defaults to /dev/null
            'stdout' => '/path/to/stdout.txt',  // defaults to /dev/null
            'stderr' => '/path/to/stderr.txt',  // defaults to php://stdout
        ),
        function($stdin, $stdout, $stderr) { // these parameters are optional
            while (true) {
                // do whatever it is daemons do
                sleep(1); // sleep is good for you
            }
        }
    );
    echo "daemon is now running.\n";
}

The PID file is an ordinary text file with the process ID as its only content. It will be created by the library automatically if it doesn't exist. It is highly recommended to put a call to sleep to ease the system load.

Daemon::kill($pid, $delete = false)

Kill a daemonized process:

<?php
use TiMMiT\Daemon;

if (Daemon::isRunning('/path/to/process.pid')) {
    echo "killing running daemon ...\n";
    if (Daemon::kill('/path/to/process.pid')) {
        echo "daemon killed.\n";
    } else {
        echo "failed killing daemon.\n";
    }
} else {
    echo "nothing to kill.\n";
}

If the second parameter is set to true, this function will try to delete the PID file after successfully sending the process a kill signal.

Acknowledgments

The text color and style specifiers are taken entirely from PEAR's Console_Color class by Stefan Walk. The Daemon class is heavily inspired from Andy Thompson's blog post on daemonizing a PHP CLI script on a POSIX system.

License

MIT

Credits

• Nofriandi Ramenta nramenta@gmail.com: autor of original source code (you can found it here)
• oNeDaL onedal@voodoo.technology: autor of first fork source code (you can found it here)