apache log parser

#!/usr/bin/php
<?php
    /**
     * This script is designed to take in the standard apache "combined" log format
     * and parse it into it's components. Then, store them in the the mongo database
     * named whatever the hostname of the server is.
     *
     * @version 1.0
     * @author Breaker One <breaker1@gmail.com>
     */
    $in = fopen("php://stdin", "r");
    ob_implicit_flush(true);

    /**
     * Beginning in Apache 2, piped log programs are
     * expected to act like daemons
     */
    while($line = fgets($in) ) {

        /** Be sure we're not dealing with empty data here */
        if( strlen($line) > 3){

            /**
             * Using the "combined" log format, this should produce an array with the following
             * remote_host, remote_logname, remote_user, request_datetime, request_type,
             * request_resource, request_version, status_code, request_size, referer, user_agent
             */
            preg_match("/(?P<remote_host>[a-zA-Z0-9\.]+)\s(?P<remote_logname>[[:alpha:][:punct:]]+)\s(?P<remote_user>[[:alpha:][:punct:]]+)\s\[(?P<request_datetime>.+)]\s\"(?P<request_type>.*?)\s(?P<request_resource>.*?)\s(?P<request_version>.*?)\"\s(?P<status_code>[0-9]{3})\s(?P<request_size>[0-9\-]+)\s\"(?P<referer>.*?)\"\s\"(?P<user_agent>.*?)\"/", $line, $entry);

            // Loop through the results and make them look how we need
            foreach($entry as $key=>$value){

                // We only want our named groups, not the rest of the matches
                if( is_int($key) ) {
                    unset($entry[$key]);
                }

                // Turn the request time into the date object
                elseif($key == "request_datetime"){
                    $entry[$key] = new MongoDate( strtotime($value) );
                }

                // Apache uses - to represent null, we actually want null
                elseif($value == "-"){
                    $entry[$key] = null;
                }

                // Break the request resource out to the resource and an array of parameters
                elseif($key == "request_resource"){
                    $parts = explode("?", $entry["request_resource"]);
                    if( count($parts) == 2 ) {

                        // break each set of key=val out
                        $request_params = array();
                        $params = explode("&", $parts[1]);
                        foreach($params as $param){

                            // insert the key and value into our array
                            $keyval = explode("=", $param);

                            // store things as ints when possible
                            if( is_numeric($keyval[1]) ){
                                $request_params[$keyval[0]] = (int)$keyval[1];
                            }
                            else{
                                $request_params[$keyval[0]] = $keyval[1];
                            }

                        }

                        // change the request resource to be just the file and add the request params array
                        $entry[$key] = $parts[0];
                        $entry["request_parameters"] = $request_params;
                    }
                }
            }

            try{
                $host = exec("hostname");
                $mongo = new Mongo("mongodb://127.0.0.1:27017");
                $database = $mongo->selectDB("apache_access_log_{$host}");
                $database->entries->insert($entry);
            }
            catch( MongoConnectionException $e){
                var_dump($e);
            }

        }
    }

    exit(0);
?>