mysql — PHP-фэнтезийная спортивная функция для веб-приложения

У меня проблема с симуляцией, и я попытался решить ее так: это не ранец, но он работает!

knapsack.php:

$lineup = new LineUp();
$lineup->setSystem($system);
$lineup->budget = $budget;

$gks  = getMinPlayer(POS_GK, $lineup->gk, $where, 1);
$defs = getMinPlayer(POS_DEF, $lineup->def, $where, 1);
$mfs  = getMinPlayer(POS_MF, $lineup->mf, $where, 2);
$fors = getMinPlayer(POS_FOR, $lineup->for, $where, 1);

// ALL
$players = new Players();
$players->addPlayers($gks);
$players->addPlayers($defs);
$players->addPlayers($mfs);
$players->addPlayers($fors);

$steps = 0;
$bestteam = new Players();
$maxvalue = -5;
$squad = new LineUp();

$value = knapSack($players, $squad, 0, '');
echo '<h2>KnapSack ('.$steps.'): ' . $value . '</h2>';

echo "<h3>".$bestteam->costs()." Mio. &euro; - ".$bestteam->points()." P</h3>";
echo $bestteam->getInfo('Best');

api_knapsack.php:

define("POS_GK", 1);
define("POS_DEF", 2);
define("POS_MF", 3);
define("POS_FOR", 4);

// Aufstellung: Z.B.: 1-3-5-2
define("SYS_352", 0);
define("SYS_451", SYS_352 + 1);
define("SYS_442", SYS_451 + 1);
define("SYS_433", SYS_442 + 1);
define("SYS_343", SYS_433 + 1);

class Players {

public $player = array();

function addPlayers($players) {
$this->player = array_merge( $this->player, $players->player);
}

function setPlayers($players) {
$this->player = array();
$this->addPlayers($players);
}

function costs() {
$euro = 0;
$count = count($this->player);
for ($i=0; $i < $count; $i++) {
if($this->player[$i]->lineup == 1) {
$euro += $this->player[$i]->euro;
}
}
return $euro;
}

function points() {
$points = 0;
$count = count($this->player);
for ($i=0; $i < $count; $i++) {
if($this->player[$i]->lineup == 1) {
$points += $this->player[$i]->points;
}
}
return $points;
}

function addToTeam($no) {
$this->player[$no]->lineup = 1;
}function getPlayer($caption) {
$count = count($this->player);
$result = "<h2>$caption ($count):</h2>";
$result .= '<table class=\"striped\"><tr><th>Name</th><th>Pt.</th><th>Euro</th><th>Pos.</th><th>Club</th><th>LineUp</th></tr>';
for ($i=0; $i < $count; $i++) {
$result .= "<tr>".$this->player[$i]->getInfoRow()."</tr>";
}
$result .= "</table>";
return $result;
}

function getInfo($caption) {
$count = count($this->player);
$inc = 0;
$playerstext = "";
for ($i=0; $i < $count; $i++) {
if($this->player[$i]->lineup == 1) {
$inc++;
$playerstext .= "<tr>" . $this->player[$i]->getInfoRow() . "</tr>";
}
}
$result = "<h2>$caption ($inc):</h2>";
$result .= '<table class="striped"><tr><th>Name</th><th>Pt.</th><th>Euro</th><th>Pos.</th><th>Club</th><th>LineUp</th></tr>';
$result .= $playerstext;
$result .= "</table>";
return $result;
}

function getInfoCount($lineup, $pos) {
$result = "<h3>";
switch ($pos) {
case POS_GK:
$result .= "Goalkeeper ($lineup->gk): ";
break;
case POS_DEF:
$result .= "Defense ($lineup->def): ";
break;
case POS_MF:
$result .= "Midfield ($lineup->mf): ";
break;
case POS_FOR:
$result .= "Forward ($lineup->for): ";
break;
}

return $result . count($this->player) . '</h3>';
}
}

class Player {
public $name;       // Name
public $points;     // Expected Points
public $euro;       // Cost
public $position;   // Position
public $club;
public $lineup;     // Is Player positioned in team? 0/1

function __construct($name) {
$this->name = $name;
$this->points = 0;
$this->euro = 0;
$this->position = 0;
$this->club = 0;
$this->lineup = 0;
}

function getInfoRow() {
return "<td>$this->name</td>" .
"<td>$this->points</td>" .
"<td>$this->euro</td>" .
"<td>$this->position</td>" .
"<td>$this->club</td>" .
"<td>$this->lineup</td>";
}
}

class LineUp {
public $gk;     // Goalkeeper
public $def;    // Defense
public $mf;     // Midfield
public $for;    // Forward
public $budget;

function __construct() {
$this->reset();
}

function setSystem($system)
{
$this->gk = 1;
$this->def = 3;
$this->mf = 5;
$this->for = 2;
switch ($system) {
case SYS_451:
$this->def = 4;
$this->mf = 5;
$this->for = 1;
break;
case SYS_442:
$this->def = 4;
$this->mf = 4;
$this->for = 2;
break;
case SYS_433:
$this->def = 4;
$this->mf = 3;
$this->for = 3;
break;
case SYS_343:
$this->def = 3;
$this->mf = 4;
$this->for = 3;
break;
}
}

function reset() {
$this->gk = 0;
$this->def = 0;
$this->mf = 0;
$this->for = 0;
$this->budget = 0;
}

function addPlayer($player) {
$this->budget = $this->budget + $player->euro;
switch ($player->position) {
case POS_GK:
$this->gk++;
break;
case POS_DEF:
$this->def++;
break;
case POS_MF:
$this->mf++;
break;
case POS_FOR:
$this->for++;
break;
}
}

function full($lineup) {
return
($this->gk  == $lineup->gk) and
($this->def == $lineup->def) and
($this->mf  == $lineup->mf) and
($this->for == $lineup->for);
}

function fuller($lineup) {
return
($this->gk  > $lineup->gk) or
($this->def > $lineup->def) or
($this->mf  > $lineup->mf) or
($this->for > $lineup->for);
}

function costly($lineup) {
return (($this->budget) > ($lineup->budget));
//var_dump($this);
//var_dump($lineup);
//return true;
}
}

function getMinPlayer($pos, $count, $where, $add) {

$players = new Players();

$whereClause = "PositionID = $pos " . $where;

$sql  = "Select B.* from (Select * from View_Kicker where $whereClause";
$sql .= " order by Punkte desc limit 0, " . ($count + $add);
$sql .= ") B order by B.Euro desc";
$erg = mysql_query($sql);
while ($adr = mysql_fetch_array($erg)) {
$player = new Player($adr['Name']);
$player->points = $adr['Punkte'];
$player->euro = $adr['Euro'];
$player->position = $pos;
$players->player[] = $player;
}
return $players;
}

function getPlayer($pos, $count, $where) {

$players = new Players();

$whereClause = "PositionID = $pos " . $where;

$sql  = "Select * from View_Kicker where $whereClause";
$sql .= " and PunkteVJ > 0";
$sql .= " order by Euro";
$erg = mysql_query($sql);
while ($adr = mysql_fetch_array($erg)) {

$euro = $adr['Euro'];
$points = $adr['PunkteVJ'];

$sql2 = mysql_query("Select count(*) as Anz from View_Kicker where $whereClause  and Euro < $euro and PunkteVJ > $points");
$erg2 = mysql_fetch_object($sql2);
$no = $erg2->Anz;

if ($no < $count) {
$player = new Player($adr['Name']);
$player->points = $adr['PunkteVJ'];
$player->euro = $adr['Euro'] * 10;
$player->position = $pos;
$players->player[] = $player;
}
}
return $players;
}

/**
* @param $players      - all players to handle
* @param $squad        - actual lineup ( how many players are in team)
* @param $count        - whicht player to handle
* @param $deep         - only for output
* @return int|mixed
*/
function knapSack($players, $squad, $count, $deep) {
global $lineup; // global lineup like 3-5-2 and 42.5mio budget
global $steps;  // only for output: method requests
global $bestteam;
global $maxvalue;
$steps++;

//echo '<br>No.: ' . $steps . ' ('.$deep.')';

// Last Child in Tree
if ($count > count($players->player) - 1) {
//echo ' -3';
return -3;
}
// actual Team to expensive
if ($squad->costly($lineup)) {
//echo ' -2';
return -2;
}
// Team to full
if ($squad->fuller($lineup)) {
//echo ' -1';
return -1;
}
// PERFECT TEAM
if ($squad->full($lineup)) {
$points = $players->points();
if ($points > $maxvalue) {
$maxvalue = $points;
$bestteam->setPlayers($players);
}
return $points;
}
// To many players from a club
//TODO

$player = $players->player[$count];
// echo '- handle '.$player->name.' ('.$count.')<br>';

$newplayers = unserialize(serialize($players));
$newsquad   = unserialize(serialize($squad));

$newplayers->addToTeam($count);
$newsquad->addPlayer($player);

return max(
knapSack($players, $squad, $count + 1, $deep . '0'),  // Add Player NOT to team
knapSack($newplayers, $newsquad, $count + 1, $deep . '1') // Add Player to team
);
}

Теперь он работает, но не может обрабатывать большие данные [плееры] в браузере. Если вы хотите, мы можем улучшить алгоритм вместе.