I won't be optimising, rewriting or otherwise working on this in the future, but I'll post this here anyway. Perhaps as an example of everything one should not do in a plugin.. Feel free to do whatever with the code soup, like, move to code snippets.

ABGap shows a chat message with the gap delta to the car ahead (when the viewed car crosses a split) and behind (when the car behind the viewed car crosses a split).



---

Notes:
- Tested with PHP 7, PRISM version 0.4.6.4.
- Uses SQLite3, so php_sqlite3.dll needs to be enabled in php.ini.
- Gap is to the car that was ahead/behind at the split, not necessarily to the car that is currently ahead or behind if positions have changed.
- Super hacky, ewww.

/path/to/prism/plugins/ABGap.php

Spoiler - click to reveal


<?php 
class ABGap extends Plugins
{
    const URL = '';
    const NAME = 'ABGap';
    const AUTHOR = 'notanillusion';
    const VERSION = '0.0.5';
    const DESCRIPTION = 'Gap delta to car ahead and behind';

    public function __construct() {        
        $this->registerPacket('onLap', ISP_LAP);    // record times, display gaps
        $this->registerPacket('onMci', ISP_MCI);    // update positions
        $this->registerPacket('onNpl', ISP_NPL);    // add new plids
        $this->registerPacket('onPll', ISP_PLL);    // remove unusued plids
        $this->registerPacket('onRst', ISP_RST);    // update total splits and laps, fresh db table
        $this->registerPacket('onSpx', ISP_SPX);    // record times, display gaps
        $this->registerPacket('onSta', ISP_STA);    // update viewplid
            
        $this->consts = array(
            'GAP_AHEAD' => -1,
            'GAP_BEHIND' => 1,
            
            'SPLIT_LAP' => 255
        );
        
        $this->db = $this->newDb();
        if (!$this->db)
            die('Failed to create database.'.PHP_EOL);

        $result = $this->createTable($this->db);
        if (!$result)
            die('Failed to create table.'.PHP_EOL);
        
        $this->playerData = array();    // plid => array(pos, lap), ...
        $this->viewPlid = 0;
        $this->laps = 0;
        $this->splits = 0;
    }
    
    public function __destruct() {
        $this->db->close();
    }
    
    /// *** PACKET FUNCTIONS START *** ///
    
    public function onLap(IS_LAP $lap) {
        if (!count($this->playerData))        // ignore hotlap mode
            return;
        
        $pos = $this->playerData[$lap->PLID]['pos'];
            
        $q = "INSERT INTO timing (plid, lap, split, pos, time)
            VALUES ($lap->PLID, $lap->LapsDone, ".$this->consts['SPLIT_LAP'].", $pos, $lap->ETime)";
            
        $result = $this->db->exec($q);
        
        // Don't check for gap ahead if we're 1st.
        if ($lap->PLID === $this->viewPlid && $this->playerData[$this->viewPlid]['pos'] > 1) {
            $plidAhead = $this->getPlidAhead($pos, $lap->LapsDone, $this->consts['SPLIT_LAP']);
            
            // Sometimes when cars are really close to one another across a split, the SPX for the car behind in positions
            // can arrive first. Don't display gap when that happens.
            if ($plidAhead === null) {
                return;
            }
            $this->sendGap($plidAhead, $this->consts['GAP_AHEAD'], $lap->LapsDone, $this->consts['SPLIT_LAP']);
        }
        
        // Don't check for gap behind if we're last.
        if (!$this->isLastPlaceByPlid($this->viewPlid)) {
            if ($this->getPlidAhead($pos, $lap->LapsDone, $this->consts['SPLIT_LAP']) == $this->viewPlid)
                $this->sendGap($lap->PLID, $this->consts['GAP_BEHIND'], $lap->LapsDone, $this->consts['SPLIT_LAP']);
        }
    }

    public function onMci(IS_MCI $mci) {
        foreach ($mci->Info as $compcar) {
            if (!$compcar->Position)
                continue;
            $this->playerData[$compcar->PLID]['pos'] = $compcar->Position;
            $this->playerData[$compcar->PLID]['lap'] = $compcar->Lap;
        }
    }
    
    public function onNpl(IS_NPL $npl) {
        $this->playerData[$npl->PLID]['pos'] = $npl->NumP;
        $this->playerData[$npl->PLID]['lap'] = 1;
    }
    
    public function onPll(IS_PLL $pll) {
        unset($this->playerData[$pll->PLID]);
    }
    
    public function onRst(IS_RST $rst) {
        $this->laps = $rst->RaceLaps;
        $this->splits = $this->getNumSplitsRst($rst);
        
        $this->playerData = array();
        
        $result = $this->createTable($this->db);
        if (!$result) {
            echo('Failed to create table.'.PHP_EOL);
            return;
        }
}
    
    public function onSpx(IS_SPX $spx) {
        if (!count($this->playerData))
            return;
        
        $pos = $this->playerData[$spx->PLID]['pos'];
        $lap = $this->playerData[$spx->PLID]['lap'];
        
        if (!$lap) $lap++;
        
        $q = "INSERT INTO timing (plid, lap, split, pos, time)
            VALUES ($spx->PLID, $lap, $spx->Split, {$this->playerData[$spx->PLID]['pos']}, $spx->ETime)";
            
        $result = $this->db->exec($q);
        
        if ($spx->PLID === $this->viewPlid && $this->playerData[$this->viewPlid]['pos'] > 1) {
            $plidAhead = $this->getPlidAhead($pos, $lap, $spx->Split);
            
            if ($plidAhead === null) {
                return;
            }
            $this->sendGap($plidAhead, $this->consts['GAP_AHEAD'], $lap, $spx->Split);
        }
        
        if (!$this->isLastPlaceByPlid($this->viewPlid)) {
            if ($this->getPlidAhead($pos, $lap, $spx->Split) == $this->viewPlid) {
                $this->sendGap($spx->PLID, $this->consts['GAP_BEHIND'], $lap, $spx->Split);
            }
        }
    }
    
    public function onSta(IS_STA $sta) {
        $this->viewPlid = $sta->ViewPLID;
    }
    
    /// *** PACKET FUNCTIONS END *** ///
    
    function createTable($db) {
        $q = 'DROP TABLE timing';
        @$this->db->exec($q);
        
        $q = 'CREATE TABLE timing(
            id INTEGER PRIMARY KEY ASC,
            plid INTEGER,
            lap INTEGER,
            split INTEGER,
            pos INTEGER,
            time INTEGER
        )';
        
        $result = $this->db->exec($q);

        return $result;
    }
    
    function getNumSplitsRst($rst) {
        $splits = 0;
        
        for ($i = 3; $i > 0; $i--) {
            if ($rst->{"Split$i"} && $rst->{"Split$i"} != 65535) {
                $splits = $i;
                break;
            }
        }
        return $splits;
    }
    
    function getPlidAhead($pos, $lap, $split) {
        $pos--;

        $q = "SELECT plid FROM timing WHERE pos=$pos AND lap=$lap AND split=$split;";
        $result = $this->db->query($q);
        
        if ($result === false)
            return;
        $row = $result->fetchArray();
        
        return $row['plid'];
    }
    
    function getTime($plid, $lap, $split) {
        $q = "SELECT * FROM timing WHERE plid=$plid AND lap=$lap AND split=$split;";
        $result = $this->db->query($q);
        
        $time = 0;

        while($row = $result->fetchArray()) {
            if (array_key_exists('time', $row))
                $time = $row['time'];
        }
        
        return $time;
    }
    
    function isLastPlaceByPlid($plid) {
        if ($this->playerData[$plid]['pos'] >= count($this->playerData)) {
            return true;
        }
        
        return false;
    }
    
    function ms2str ($ms, $ahead) {
        $retval = '';
        
        $hour = abs($ms / (1000 * 60 * 60));
        if ($hour >= 1) {
            $retval .= strval(intval($hour)) . ':';
        }
        
        $min = ($hour - intval($hour)) * 60;
        if ($hour >= 1 && $min < 1) {
            $retval .= '00:';
        }
        else if ($min >= 10) {
            $retval .= strval(intval($min)) . ':';
        }
        else if ($min > 1 && $min < 10) {
            $retval .= '0' . strval(intval($min)) . ':';
        }
        
        $sec = ($min - intval($min)) * 60;
        $retval .= number_format($sec, 3);
        
        if ($ms >= 0 && $ahead < 0) {
            $retval = "^1+$retval";
        }
        
        if ($ms < 0 && $ahead < 0) {
            $retval = "^2-$retval";
        }
        
        if ($ms >= 0 && $ahead > 0) {
            $retval = "^1-$retval";
        }
        
        if ($ms < 0 && $ahead > 0) {
            $retval = "^2+$retval";
        }
        
        return $retval;
    }
    
    function newDb() {
        $db = new SQLite3(':memory:');
        return $db;
    }
    
    function getGap($a, $b, $lap, $split) {
        $plidACurTime = $this->getTime($a, $lap, $split);
        $plidBCurTime = $this->getTime($b, $lap, $split);
        $gap = $plidACurTime - $plidBCurTime;
        
        return $gap;
    }
    
    function sendGap($plid, $mode, $lap, $split) {
        if ($split === false)
            return;
        
        $curGap = $this->getGap($this->viewPlid, $plid, $lap, $split);
        
        switch ($split) {
            case 255:
                $split = $this->splits;
            break;
            
            case 1:
                $split = 255;
                $lap--;
            break;
            
            default:
                $split--;
            break;
        }
        
        $prevGap = $this->getGap($this->viewPlid, $plid, $lap, $split);
        
        $gapDelta = $curGap - $prevGap;

        if ($mode == $this->consts['GAP_BEHIND']) {
            $msg = '^3Gap delta to car behind: ';
        } else {
            $msg = '^3Gap delta to car ahead: ';
        }
        
        $timemsg = $this->ms2str($gapDelta, $mode);
        $msg .= $timemsg;
        
        IS_MSL()->Msg($msg)->Send();
    }
}
?>



Or http://pastebin.com/WDFa1VxX

I may "borrow" some of this code for the Timing&Scoring plugin.

Added one more ugly hack to sendGap() for dealing with tracks that have zero splits (lap only). Previously it should have thrown index notices or worse. Untested because I can't do so with the AIs, and couldn't find a server running a custom track that has people on it.

Btw, is there a spoiler tag on this forum, because it would be useful for hiding these big blocks of code..

Now it's unsupported

ABGap v0.0.6

Spoiler - click to reveal


<?php 
class ABGap extends Plugins
{
    const URL = 'https://www.lfs.net/forum/thread/89031-ABGap-%28code-dump%2C-unsupported%29';
    const NAME = 'ABGap';
    const AUTHOR = 'notanillusion';
    const VERSION = '0.0.6';
    const DESCRIPTION = 'Gap delta to car ahead and behind';

    public function __construct() {        
        $this->registerPacket('onLap', ISP_LAP);    // record times, display gaps
        $this->registerPacket('onMci', ISP_MCI);    // update positions
        $this->registerPacket('onNpl', ISP_NPL);    // add new plids
        $this->registerPacket('onPll', ISP_PLL);    // remove unusued plids
        $this->registerPacket('onRst', ISP_RST);    // update total splits and laps, fresh db table
        $this->registerPacket('onSpx', ISP_SPX);    // record times, display gaps
        $this->registerPacket('onSta', ISP_STA);    // update viewplid
            
        $this->consts = array(
            'GAP_AHEAD' => -1,
            'GAP_BEHIND' => 1,
            
            'SPLIT_LAP' => 255
        );
        
        $this->db = $this->newDb();
        if (!$this->db)
            die('Failed to create database.'.PHP_EOL);

        $result = $this->createTable($this->db);
        if (!$result)
            die('Failed to create table.'.PHP_EOL);
        
        $this->playerData = array();    // plid => array(pos, lap), ...
        $this->viewPlid = 0;
        $this->laps = 0;
        $this->splits = 0;
    }
    
    public function __destruct() {
        $this->db->close();
    }
    
    /// *** PACKET FUNCTIONS START *** ///
    
    public function onLap(IS_LAP $lap) {
        if (!count($this->playerData))        // ignore hotlap mode
            return;
        
        $pos = $this->playerData[$lap->PLID]['pos'];
            
        $q = "INSERT INTO timing (plid, lap, split, pos, time)
            VALUES ($lap->PLID, $lap->LapsDone, ".$this->consts['SPLIT_LAP'].", $pos, $lap->ETime)";
            
        $result = $this->db->exec($q);
        
        // Don't check for gap ahead if we're 1st.
        if ($lap->PLID === $this->viewPlid && $this->playerData[$this->viewPlid]['pos'] > 1) {
            $plidAhead = $this->getPlidAhead($pos, $lap->LapsDone, $this->consts['SPLIT_LAP']);
            
            // Sometimes when cars are really close to one another across a split, the SPX for the car behind in positions
            // can arrive first. Don't display gap when that happens.
            if ($plidAhead === null) {
                return;
            }
            $this->sendGap($plidAhead, $this->consts['GAP_AHEAD'], $lap->LapsDone, $this->consts['SPLIT_LAP']);
        }
        
        // Don't check for gap behind if we're last.
        if (!$this->isLastPlaceByPlid($this->viewPlid)) {
            if ($this->getPlidAhead($pos, $lap->LapsDone, $this->consts['SPLIT_LAP']) == $this->viewPlid)
                $this->sendGap($lap->PLID, $this->consts['GAP_BEHIND'], $lap->LapsDone, $this->consts['SPLIT_LAP']);
        }
    }

    public function onMci(IS_MCI $mci) {
        foreach ($mci->Info as $compcar) {
            if (!$compcar->Position)
                continue;
            $this->playerData[$compcar->PLID]['pos'] = $compcar->Position;
            $this->playerData[$compcar->PLID]['lap'] = $compcar->Lap;
        }
    }
    
    public function onNpl(IS_NPL $npl) {
        $this->playerData[$npl->PLID]['pos'] = $npl->NumP;
        $this->playerData[$npl->PLID]['lap'] = 1;
    }
    
    public function onPll(IS_PLL $pll) {
        unset($this->playerData[$pll->PLID]);
    }
    
    public function onRst(IS_RST $rst) {
        $this->laps = $rst->RaceLaps;
        $this->splits = $this->getNumSplitsRst($rst);
        
        $this->playerData = array();
        
        $result = $this->createTable($this->db);
        if (!$result) {
            echo('Failed to create table.'.PHP_EOL);
            return;
        }
}
    
    public function onSpx(IS_SPX $spx) {
        if (!count($this->playerData))
            return;
        
        $pos = $this->playerData[$spx->PLID]['pos'];
        $lap = $this->playerData[$spx->PLID]['lap'];
        
        if (!$lap) $lap++;
        
        $q = "INSERT INTO timing (plid, lap, split, pos, time)
            VALUES ($spx->PLID, $lap, $spx->Split, {$this->playerData[$spx->PLID]['pos']}, $spx->ETime)";
            
        $result = $this->db->exec($q);
        
        if ($spx->PLID === $this->viewPlid && $this->playerData[$this->viewPlid]['pos'] > 1) {
            $plidAhead = $this->getPlidAhead($pos, $lap, $spx->Split);
            
            if ($plidAhead === null) {
                return;
            }
            $this->sendGap($plidAhead, $this->consts['GAP_AHEAD'], $lap, $spx->Split);
        }
        
        if (!$this->isLastPlaceByPlid($this->viewPlid)) {
            if ($this->getPlidAhead($pos, $lap, $spx->Split) == $this->viewPlid) {
                $this->sendGap($spx->PLID, $this->consts['GAP_BEHIND'], $lap, $spx->Split);
            }
        }
    }
    
    public function onSta(IS_STA $sta) {
        $this->viewPlid = $sta->ViewPLID;
    }
    
    /// *** PACKET FUNCTIONS END *** ///
    
    function createTable($db) {
        $q = 'DROP TABLE timing';
        @$this->db->exec($q);
        
        $q = 'CREATE TABLE timing(
            id INTEGER PRIMARY KEY ASC,
            plid INTEGER,
            lap INTEGER,
            split INTEGER,
            pos INTEGER,
            time INTEGER
        )';
        
        $result = $this->db->exec($q);

        return $result;
    }
    
    function getNumSplitsRst($rst) {
        $splits = 0;
        
        for ($i = 3; $i > 0; $i--) {
            if ($rst->{"Split$i"} && $rst->{"Split$i"} != 65535) {
                $splits = $i;
                break;
            }
        }
        return $splits;
    }
    
    function getPlidAhead($pos, $lap, $split) {
        $pos--;

        $q = "SELECT plid FROM timing WHERE pos=$pos AND lap=$lap AND split=$split;";
        $result = $this->db->query($q);
        
        if ($result === false)
            return;
        $row = $result->fetchArray();
        
        return $row['plid'];
    }
    
    function getTime($plid, $lap, $split) {
        $q = "SELECT * FROM timing WHERE plid=$plid AND lap=$lap AND split=$split;";
        $result = $this->db->query($q);
        
        $time = 0;

        while($row = $result->fetchArray()) {
            if (array_key_exists('time', $row))
                $time = $row['time'];
        }
        
        return $time;
    }
    
    function isLastPlaceByPlid($plid) {
        if ($this->playerData[$plid]['pos'] >= count($this->playerData)) {
            return true;
        }
        
        return false;
    }
    
    function ms2str ($ms, $ahead) {
        $retval = '';
        
        $hour = abs($ms / (1000 * 60 * 60));
        if ($hour >= 1) {
            $retval .= strval(intval($hour)) . ':';
        }
        
        $min = ($hour - intval($hour)) * 60;
        if ($hour >= 1 && $min < 1) {
            $retval .= '00:';
        }
        else if ($min >= 10) {
            $retval .= strval(intval($min)) . ':';
        }
        else if ($min > 1 && $min < 10) {
            $retval .= '0' . strval(intval($min)) . ':';
        }
        
        $sec = ($min - intval($min)) * 60;
        $retval .= number_format($sec, 3);
        
        if ($ms >= 0 && $ahead < 0) {
            $retval = "^1+$retval";
        }
        
        if ($ms < 0 && $ahead < 0) {
            $retval = "^2-$retval";
        }
        
        if ($ms >= 0 && $ahead > 0) {
            $retval = "^1-$retval";
        }
        
        if ($ms < 0 && $ahead > 0) {
            $retval = "^2+$retval";
        }
        
        return $retval;
    }
    
    function newDb() {
        $db = new SQLite3(':memory:');
        return $db;
    }
    
    function getGap($a, $b, $lap, $split) {
        $plidACurTime = $this->getTime($a, $lap, $split);
        $plidBCurTime = $this->getTime($b, $lap, $split);
        $gap = $plidACurTime - $plidBCurTime;
        
        return $gap;
    }
    
    function sendGap($plid, $mode, $lap, $split) {
        if ($split === false)
            return;
        
        if ($this->splits === 0) {
            $split = 255;
        }
        
        $curGap = $this->getGap($this->viewPlid, $plid, $lap, $split);
        
        switch ($split) {
            case 255:
                $split = $this->splits;
            break;
            
            case 1:
                $split = 255;
                $lap--;
            break;
            
            default:
                if ($this->splits === 0) {
                    $lap--;
                } else {
                    $split--;
                }
            break;
        }
        
        $prevGap = $this->getGap($this->viewPlid, $plid, $lap, $split);
        
        $gapDelta = $curGap - $prevGap;

        if ($mode == $this->consts['GAP_BEHIND']) {
            $msg = '^3Gap delta to car behind: ';
        } else {
            $msg = '^3Gap delta to car ahead: ';
        }
        
        $timemsg = $this->ms2str($gapDelta, $mode);
        $msg .= $timemsg;
        
        IS_MSL()->Msg($msg)->Send();
    }
}
?>



http://pastebin.com/KtsS07v5

Congrats on being the first "Approved" Plugin.

Btw, what is the procedure to follow if a submission is updated significantly enough that it may warrant re-approval? Post in the approved thread, re-submit, etc.?

Why so much hassle with a sql database while a memory array could do the job perfectly fine?

0.0.7
- tidying, cleanup
- no sql

Spoiler - click to reveal


<?php 

class ABGap extends Plugins
{
    const URL = 'https://www.lfs.net/forum/thread/89031-ABGap-%28code-dump%2C-unsupported%29';
    const NAME = 'ABGap';
    const AUTHOR = 'notanillusion';
    const VERSION = '0.0.7';
    const DESCRIPTION = 'Gap delta to car ahead and behind';
    
    const GAP_AHEAD = -1;
    const GAP_BEHIND = 1;
    
    const SPLIT_LAP = 255;

    public function __construct ()
    {        
        $this->registerPacket('onLap', ISP_LAP);    // record times, display gaps
        $this->registerPacket('onMci', ISP_MCI);    // update positions
        $this->registerPacket('onNpl', ISP_NPL);    // add new plids
        $this->registerPacket('onPll', ISP_PLL);    // remove unusued plids
        $this->registerPacket('onRst', ISP_RST);    // update total splits and laps, fresh db table
        $this->registerPacket('onSpx', ISP_SPX);    // record times, display gaps
        $this->registerPacket('onSta', ISP_STA);    // update viewplid
        
        $this->timing = array();        // plid, lap, split, pos, time
        $this->playerData = array();    // plid => array(pos, lap), ...
        $this->viewPlid = 0;
        $this->laps = 0;
        $this->splits = 0;
    }
    
    /// *** PACKET FUNCTIONS START *** ///
    
    public function onLap (IS_LAP $lap)
    {
        if (!count($this->playerData)) { return; }         // ignore hotlap mode
        
        $pos = $this->playerData[$lap->PLID]['pos'];
        $this->addTime($lap->PLID, $lap->LapsDone, $this::SPLIT_LAP, $pos, $lap->ETime);
        
        // Don't check for gap ahead if we're 1st.
        if ($lap->PLID === $this->viewPlid && $this->playerData[$this->viewPlid]['pos'] > 1)
        {
            $plidAhead = $this->getPlidAhead($pos, $lap->LapsDone, $this::SPLIT_LAP);
            
            // Sometimes when cars are really close to one another across a split, the SPX for the car behind in positions
            // can arrive first. Don't display gap when that happens.
            if ($plidAhead === null) { return; }

            $this->sendGap($plidAhead, $this::GAP_AHEAD, $lap->LapsDone, $this::SPLIT_LAP);
        }
        
        // Don't check for gap behind if we're last.
        if (!$this->isLastPlaceByPlid($this->viewPlid))
        {
            if ($this->getPlidAhead($pos, $lap->LapsDone, $this::SPLIT_LAP) == $this->viewPlid)
            {
                $this->sendGap($lap->PLID, $this::GAP_BEHIND, $lap->LapsDone, $this::SPLIT_LAP);
            }
        }
    }

    public function onMci (IS_MCI $mci)
    {
        foreach ($mci->Info as $compcar)
        {
            if (!$compcar->Position) { continue; }
            
            $this->playerData[$compcar->PLID]['pos'] = $compcar->Position;
            $this->playerData[$compcar->PLID]['lap'] = $compcar->Lap;
        }
    }
    
    public function onNpl (IS_NPL $npl)
    {
        $this->playerData[$npl->PLID]['pos'] = $npl->NumP;
        $this->playerData[$npl->PLID]['lap'] = 1;
    }
    
    public function onPll (IS_PLL $pll)
    {
        unset($this->playerData[$pll->PLID]);
    }
    
    public function onRst (IS_RST $rst)
    {
        $this->laps = $rst->RaceLaps;
        $this->splits = $this->getNumSplitsRst($rst);
        
        $this->playerData = array();
        $this->timing = array();
    }
    
    public function onSpx (IS_SPX $spx)
    {
        if (!count($this->playerData)) { return; }
        
        $pos = $this->playerData[$spx->PLID]['pos'];
        $lap = $this->playerData[$spx->PLID]['lap'];
        
        if (!$lap) { $lap++; }
        
        $this->addTime($spx->PLID, $lap, $spx->Split, $this->playerData[$spx->PLID]['pos'], $spx->ETime);
        
        if ($spx->PLID === $this->viewPlid && $this->playerData[$this->viewPlid]['pos'] > 1)
        {
            $plidAhead = $this->getPlidAhead($pos, $lap, $spx->Split);
            
            if ($plidAhead === null) { return; }
            
            $this->sendGap($plidAhead, $this::GAP_AHEAD, $lap, $spx->Split);
        }
        
        if (!$this->isLastPlaceByPlid($this->viewPlid))
        {
            if ($this->getPlidAhead($pos, $lap, $spx->Split) == $this->viewPlid)
            {
                $this->sendGap($spx->PLID, $this::GAP_BEHIND, $lap, $spx->Split);
            }
        }
    }
    
    public function onSta (IS_STA $sta)
    {
        $this->viewPlid = $sta->ViewPLID;
    }
    
    /// *** PACKET FUNCTIONS END *** ///
    
    function addTime ($plid, $lap, $split, $pos, $time)
    {
        $entry = array
        (
            'plid' => $plid,
            'lap' => $lap,
            'split' => $split,
            'pos' => $pos,
            'time' => $time
        );
        
        array_push($this->timing, $entry);
    }
    
    function getGap ($a, $b, $lap, $split)
    {
        $plidACurTime = $this->getTime($a, $lap, $split);
        $plidBCurTime = $this->getTime($b, $lap, $split);
        $gap = $plidACurTime - $plidBCurTime;
        
        return $gap;
    }
    
    function getNumSplitsRst ($rst)
    {
        $splits = 0;
        
        for ($i = 3; $i > 0; $i--)
        {
            if ($rst->{"Split$i"} && $rst->{"Split$i"} != 65535)
            {
                $splits = $i;
                break;
            }
        }
        
        return $splits;
    }
    
    function getPlidAhead ($pos, $lap, $split)
    {
        $pos--;
        $plid = null;
        
        foreach ($this->timing as $entry)
        {
            if ($entry['pos'] == $pos && $entry['lap'] == $lap && $entry['split'] == $split) { $plid = $entry['plid']; }
        }
        
        return $plid;
    }
    
    function getTime ($plid, $lap, $split)
    {
        $time = 0;
        
        foreach ($this->timing as $entry)
        {
            if ($entry['plid'] == $plid && $entry['lap'] == $lap && $entry['split'] == $split) { $time = $entry['time']; }
        }
        
        return $time;
    }
    
    function isLastPlaceByPlid ($plid)
    {
        $last = false;
        
        if ($this->playerData[$plid]['pos'] >= count($this->playerData)) { $last = true; }
        
        return $last;
    }
    
    function ms2str ($ms, $ahead)
    {
        $retval = '';
        $hour = abs($ms / (1000 * 60 * 60));
        
        if ($hour >= 1)    { $retval .= strval(intval($hour)) . ':'; }
        
        $min = ($hour - intval($hour)) * 60;
        
        if ($hour >= 1 && $min < 1)    { $retval .= '00:'; }
        else if ($min >= 10) { $retval .= strval(intval($min)) . ':'; }
        else if ($min > 1 && $min < 10) { $retval .= '0' . strval(intval($min)) . ':'; }
        
        $sec = ($min - intval($min)) * 60;
        $retval .= number_format($sec, 3);
        
        if ($ms >= 0 && $ahead < 0) { $retval = "^1+$retval"; }
        else if ($ms < 0 && $ahead < 0) { $retval = "^2-$retval"; }
        else if ($ms >= 0 && $ahead > 0) { $retval = "^1-$retval"; }
        else if ($ms < 0 && $ahead > 0) { $retval = "^2+$retval"; }
        
        return $retval;
    }
    
    function sendGap ($plid, $mode, $lap, $split)
    {
        if ($split === false) { return; }
        
        if ($this->splits === 0) { $split = $this::SPLIT_LAP; }
        
        $curGap = $this->getGap($this->viewPlid, $plid, $lap, $split);
        
        switch ($split)
        {
            case $this::SPLIT_LAP:
                $split = $this->splits;
                break;
            
            case 1:
                $split = $this::SPLIT_LAP;
                $lap--;
                break;
            
            default:
                if ($this->splits === 0) { $lap--; } 
                else { $split--; }
                break;
        }
        
        $prevGap = $this->getGap($this->viewPlid, $plid, $lap, $split);
        
        $gapDelta = $curGap - $prevGap;

        if ($mode == $this::GAP_BEHIND) { $msg = '^3Gap delta to car behind: '; }
        else { $msg = '^3Gap delta to car ahead: '; }
        
        $timemsg = $this->ms2str($gapDelta, $mode);
        $msg .= $timemsg;
        
        IS_MSL()->Msg($msg)->Send();
    }
}

?>



Now thats an excellent job.. Will test it

SplStructs if you want to be really fancy.