hook_boot

<?php
/**
 * Implements hook_help.
 *
 * Displays help and module information.
 *
 * @param path
 *   Which path of the site we're using to display help
 * @param arg
 *   Array that holds the current path as returned from arg() function
 */
function site_visitors_help($path, $arg) {
    switch ($path) {
    case "admin/help#site_visitors":
        return '<p>' . t("Displays links to nodes created on this date") . '</p>';
        break;
    }
}

/**
 * Implements hook_init().
 */
function site_visitor_boot() {
    site_visitors_insert();
}

/**
 * Custom visitor function.
 *
 * Insert IP Address, URL to the database
 *
 * @return
 *   A result set of the targeted posts.
 */
function site_visitors_insert(){
    $tracker = array(
        'database' => 'c1tracker',
        'username' => 'c1tracker',
        'password' => 'NdA8A5SXcz7s',
        'host' => 'localhost',
        'driver' => 'mysql',
    );

    Database::addConnectionInfo('tracker', 'default', $tracker);
    db_set_active('tracker');

    //This should be put above html tag in html.tpl.php
    /*
    <?php
    $time = microtime();
    $time = explode(' ', $time);
    $time = $time[1] + $time[0];
    $start = $time;
    ?>
    */

    //This code requires the code above to compute the start time. This will compute the total page load.
    $time = microtime();
    $time = explode(' ', $time);
    $time = $time[1] + $time[0];
    $finish = $time;
    $total_time = round(($finish - $start), 4);
    $t = $total_time;
    //$url = $_GET['url'];
    $url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
    $current_ip = $_SERVER['REMOTE_ADDR'];
    $user_agent = $_SERVER['HTTP_USER_AGENT'];
    $date = date("Y-m-d");
    $time =  date("h:i:s");

    function is_bot()
    {
        $botlist = array("Teoma", "alexa", "froogle", "Gigabot", "inktomi",
        "looksmart", "URL_Spider_SQL", "Firefly", "NationalDirectory",
        "Ask Jeeves", "TECNOSEEK", "InfoSeek", "WebFindBot", "girafabot",
        "crawler", "www.galaxy.com", "Googlebot", "Scooter", "Slurp",
        "msnbot", "appie", "FAST", "WebBug", "Spade", "ZyBorg", "rabaz",
        "Baiduspider", "Feedfetcher-Google", "TechnoratiSnoop", "Rankivabot",
        "Mediapartners-Google", "Sogou web spider", "WebAlta Crawler","TweetmemeBot",
        "Butterfly","Twitturls","Me.dium","Twiceler");

        foreach($botlist as $bot)
        {
            if(strpos($_SERVER['HTTP_USER_AGENT'], $bot) !== false)
            return true;
        }
    return false;
    }

    if (is_bot())
        $isbot = 1;
    else
        $isbot = 0;

    db_insert('ap_visits')
        ->fields(array(
            'id' => NULL,
            'length' => $t,
            'url' => $url,
            'current_ip' => $current_ip,
            'user_agent' => $user_agent,
            'date_start' => date("Y-m-d H:i:s"),
            'is_bot' => $isbot,
            'is_logout' => 0
        ))
        ->execute();

    db_set_active();
}