daemon.php

<?php
//http://blog.codinglabs.org/articles/write-daemon-with-php.html
//Accpet the http client request and generate response content.
//As a demo, this function just send "PHP HTTP Server" to client.
function handle_http_request($address, $port)
{
    $max_backlog = 16;
    $res_content = "HTTP/1.1 200 OK
        Content-Length: 15
        Content-Type: text/plain; charset=UTF-8
 
        PHP HTTP Server";
    $res_len = strlen($res_content);
 
    //Create, bind and listen to socket
    if(($socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === FALSE)
    {
        echo "Create socket failed!\n";
        exit;
    }   
 
    if((socket_bind($socket, $address, $port)) === FALSE)
    {
        echo "Bind socket failed!\n";
        exit;
    }
 
    if((socket_listen($socket, $max_backlog)) === FALSE)
    {
        echo "Listen to socket failed!\n";
        exit;
    }
 
    //Loop
    while(TRUE)
    {
        if(($accept_socket = socket_accept($socket)) === FALSE)
        {
            continue;
        }
        else
        {
            socket_write($accept_socket, $res_content, $res_len);   
            socket_close($accept_socket);
        }
    }
}
 
//Run as daemon process.
function run()
{
    if(($pid1 = pcntl_fork()) === 0)
    //First child process
    {
        posix_setsid(); //Set first child process as the session leader.
 
        if(($pid2 = pcntl_fork()) === 0)
        //Second child process, which run as daemon.
        {
            //Replaced with your own domain or address.
            handle_http_request('www.codinglabs.org', 9999); 
        }
        else
        {
            //First child process exit;
            exit;
        }
    }
    else
    {
        //Wait for first child process exit;
        pcntl_wait($status);
    }
}
 
//Entry point.
run();
 
?>