Debug filling scacchiera

[starcraftworld]

chessboard.php:

<?php

include("chess.php");

class Chessboard {

    public $chessboard;
    public $board;
    public $turn;
    public $input;
    public $output;

    public function __construct ($input) {
        $this->chessboard=array();
        $this->board=array();
        $this->turn="";
        $this->input=$input;
        $this->output="";
    } //__construct
    
    public function mount () {
        for ($i=0;$i<8;$i++)
            for ($j=0;$j<8;$j++) {
                $piece=substr($this->input,$i*8+$j,$i*8+$j+3);
                switch ($piece[0]) {
                    case 'E': {
                        $this->chessboard[$i][$j]=new EmptyBox($j,$i);
                        break;
                    } //case
                    case 'P': {
                        switch ($piece[1]) {
                            case 'W': {
                                switch ($piece[2]) {
                                    case 'T': {
                                        $this->chessboard[$i][$j]=new Pawn($j,$i,"WHITE",true);
                                        break;
                                    } //case
                                    case 'F': {
                                        $this->chessboard[$i][$j]=new Pawn($j,$i,"WHITE",false);
                                        break;
                                    } //case
                                } //switch
                            } //case
                            case 'B': {
                                switch ($piece[2]) {
                                    case 'T': {
                                        $this->chessboard[$i][$j]=new Pawn($j,$i,"BLACK",true);
                                        break;
                                    } //case
                                    case 'F': {
                                        $this->chessboard[$i][$j]=new Pawn($j,$i,"BLACK",false);
                                        break;
                                    } //case
                                } //switch                            
                            } //case
                        } //switch
                    } //case
                    case 'N': {
                        switch ($piece[1]) {
                            case 'W': {
                                $this->chessboard[$i][$j]=new Knight($j,$i,"WHITE");
                                break;
                            } //case
                            case 'B': {
                                $this->chessboard[$i][$j]=new Knight($j,$i,"BLACK");
                                break;
                            } //case
                        } //switch
                    } //case
                    case 'B': {
                        switch ($piece[1]) {
                            case 'W': {
                                $this->chessboard[$i][$j]=new Bishop($j,$i,"WHITE");
                                break;
                            } //case
                            case 'B': {
                                $this->chessboard[$i][$j]=new Bishop($j,$i,"BLACK");
                                break;
                            } //case
                        } //switch
                    } //case
                    case 'R': {
                        switch ($piece[1]) {
                            case 'W': {
                                switch ($piece[2]) {
                                    case 'T': {
                                        $this->chessboard[$i][$j]=new Rook($j,$i,"WHITE",true);
                                        break;
                                    } //case
                                    case 'F': {
                                        $this->chessboard[$i][$j]=new Rook($j,$i,"WHITE",false);
                                        break;
                                    } //case
                                } //switch
                            } //case
                            case 'B': {
                                switch ($piece[2]) {
                                    case 'T': {
                                        $this->chessboard[$i][$j]=new Rook($j,$i,"BLACK",true);
                                        break;
                                    } //case
                                    case 'F': {
                                        $this->chessboard[$i][$j]=new Rook($j,$i,"BLACK",false);
                                        break;
                                    } //case
                                } //switch                            
                            } //case
                        } //switch
                    } //case
                    case 'Q': {
                        switch ($piece[1]) {
                            case 'W': {
                                $this->chessboard[$i][$j]=new Queen($j,$i,"WHITE");
                                break;
                            } //case
                            case 'B': {
                                $this->chessboard[$i][$j]=new Queen($j,$i,"BLACK");
                                break;
                            } //case
                        } //switch
                    } //case
                    case 'K': {
                        switch ($piece[1]) {
                            case 'W': {
                                switch ($piece[2]) {
                                    case 'T': {
                                        $this->chessboard[$i][$j]=new King($j,$i,"WHITE",true);
                                        break;
                                    } //case
                                    case 'F': {
                                        $this->chessboard[$i][$j]=new King($j,$i,"WHITE",false);
                                        break;
                                    } //case
                                } //switch
                            } //case
                            case 'B': {
                                switch ($piece[2]) {
                                    case 'T': {
                                        $this->chessboard[$i][$j]=new King($j,$i,"BLACK",true);
                                        break;
                                    } //case
                                    case 'F': {
                                        $this->chessboard[$i][$j]=new King($j,$i,"BLACK",false);
                                        break;
                                    } //case
                                } //switch                            
                            } //case
                        } //switch
                    } //case                    
                } //switch                
            } //for
        switch ($this->input[192]) {
            case 'W': {
                $this->turn="WHITE";
                break;
            } //case
            case 'B': {
                $this->turn="BLACK";
                break;
            } //case
        } //switch
    } //mount

} //Chessboard

?>

test.php:

<?php

include("chessboard.php");

$stringa="RBTNBFBBFQBFKBTBBFNBFRBTPBFPBFPBFPBFPBFPBFPBFPBFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFEFFPWFPWFPWFPWFPWFPWFPWFPWFRWTNWFBWFQWFKWTBWFNWFRWTW";
$oggetto=new Chessboard($stringa);
$oggetto->mount();
echo $oggetto->chessboard[0][0]->getRank();
echo $oggetto->chessboard[0][1]->getRank();
        
?>

L'output dovrebbe essere (secondo le mie previsioni) "RookKnight" in quanto la getRank() restituisce il tipo del pezzo, tuttavia come output ottengo:

King 
Notice: Undefined offset: 1 
Fatal error: Call to a member function getRank() on a non-object

Qual'è il problema?

[starcraftworld]

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