View difference between Paste ID: qVFL9ckX and pEV1Aubt

 <!DOCTYPE html>
 <html>
 <head>
 <title>Chess</title>
 <meta charset="UTF-8"/>
 </head>
 <body>
 
 <?php
 function is_black($c) {
 	return ($c==='B'||$c==='Black');
 }
 function is_white($c) {
 	return ($c==='W'||$c==='White');
 }
 abstract class Piece {
 	public $x;
 	public $y;
 	public $color;
 	public $parent;
 	public function __construct(&$parent=NULL) {
 		$this->parent=$parent;
 	}
 	public function can_move($diff_x, $diff_y) { return false; }
 	public function can_eat($diff_x, $diff_y) { return $this->can_move($diff_x, $diff_y); }
 }
 class Pawn extends Piece {
 	public function can_move($diff_x, $diff_y) {
-		/*if(is_black($c)) {
+		if($this->y===6) return ($diff_y<=-1 && $diff_y>=-2);
-			if($y===1) return ($diff_y>=1 && $diff_y<=2);
+		else return ($diff_y==-1);
-			else return ($diff_y==1);
+
 	public function can_eat($diff_x, $diff_y) {
-		elseif(is_white($c)) {//*/
+		return (abs($diff_x)==1 && $diff_y==-1);
-			if($this->y===6) return ($diff_y<=-1 && $diff_y>=-2);
+
-			else return ($diff_y==-1);
+
-		/*}
+
-		return false;//*/
+
 }
 class Rook extends Piece {
-		/*if(is_black($c)) {
+
-			return (abs($diff_x)==1 && $diff_y==1);
+
 			( ($diff_x==0 && abs($diff_y)>0) || ($diff_y==0 && abs($diff_x)>0) ) &&
-		elseif(is_white($c)) {//*/
+
-			return (abs($diff_x)==1 && $diff_y==-1);
+
-		/*}
+
-		return false;//*/
+
 	public function __toString() {
 		return 'Rook';
 	}
 }
 class Knight extends Piece {
 	public function can_move($diff_x, $diff_y) {
 		return ( ( abs($diff_x)>=1 && abs($diff_x)<=2 ) && ( abs($diff_y)>=1 && abs($diff_y)<=2) && ( abs($diff_x)+abs($diff_y)==3 ) );
-		return ( ($diff_x==0 && abs($diff_y)>0) || ($diff_y==0 && abs($diff_x)>0) );
+
 	public function __toString() {
 		return 'Knight';
 	}
 }
-			$this->can_move($diff_x, $diff_y) &&
+class Bishop extends Piece {
 	public function can_move($diff_x, $diff_y) {
 		return (
 			( abs($diff_x)==abs($diff_y) ) && abs($diff_x)>0 &&
 			$this->parent->is_free($this->x, $this->y, $this->x+$diff_x, $this->y+$diff_y)
 		);
 	}
 	public function __toString() {
 		return 'Bishop';
 	}
 }
 class King extends Piece {
 	public function can_move($diff_x, $diff_y) {
 		return ( abs($diff_x)<=1 && abs($diff_y)<=1 && (abs($diff_x)+abs($diff_y)>=1) );
 	}
 	public function __toString() {
 		return 'King';
 	}
 }
 class Queen extends Piece {
 	public function can_move($diff_x, $diff_y) {
 		return (
 			(abs($diff_x)==abs(diff_y)) || ($diff_x==0 && abs($diff_y)>0) || ($diff_y==0 && abs($diff_x)>0) &&
 			$this->parent->is_free($this->x, $this->y, $this->x+$diff_x, $this->y+$diff_y)
 		);
 	}
 	public function __toString() {
 		return 'Queen';
 	}
 }
 //black up (y=0), white down (y=7)
 class board {
 	public $grid;
 	public $width;
-			if($this->get_piece($src_x+$px*$i, $src_y+$py*$i) instanceof Piece) return false;
+
 	public $cur_color;
 	public function __construct() {
 		$this->grid=array();
 		$this->width=8;
 		$this->height=8;
 		for($i=0;$i<$this->height;++$i) {
 			$this->grid[$i]=array();
 			for($j=0;$j<$this->width;++$j) {
 				$this->grid[$i][$j]='&nbsp;';
 			}
 		}
 	}
-$board->grid[7][0]='Rook';
+
-$board->grid[7][1]='Knight';
+
-$board->grid[7][2]='Bishop';
+
-$board->grid[7][3]='Queen';
+
-$board->grid[7][4]='King';
+
-$board->grid[7][5]='Bishop';
+
-$board->grid[7][6]='Knight';
+
-for($i=0;$i<8;++$i) {
+
-	$board->grid[6][$i]=new Pawn($board);
+
 		for($i=1; $i<max(abs($diff_x),abs($diff_y)); ++$i) {
-$board->grid[7][7]='Rook';
+			if($this->is_empty($src_x+$px*$i, $src_y+$py*$i)) return false;
 		}
-var_dump($board->grid[6][0]->parent->grid[7][7]);
+
-$test=new Rook($board);
+
-$test->x=0;
+
-$test->y=7;
+
-$board->grid[7][0]=clone $test;
+
-$test->x=7;
+
-$board->grid[7][7]=clone $test;
+
-var_dump($board->grid[7][0]->x);
+
 	public function add_piece($x, $y, $piece) {
 		$p=new $piece($this);
 		$p->x=$x;
 		$p->y=$y;
 		$p->color=$this->cur_color;
 		$this->grid[$y][$x]=$p;
 	}
 };
 $board=new board();
 //var_dump($board->grid);
 $board->cur_color='W';
 $h=7;
 	$board->add_piece(0, $h, 'Rook');
 	$board->add_piece(1, $h, 'Knight');
 	$board->add_piece(2, $h, 'Bishop');
 	$board->add_piece(3, $h, 'Queen');
 	$board->add_piece(4, $h, 'King');
 	$board->add_piece(5, $h, 'Bishop');
 	$board->add_piece(6, $h, 'Knight');
 	$board->add_piece(7, $h, 'Rook');
 --$h;
 	for($i=0;$i<8;++$i) {
 		$board->add_piece($i, $h, 'Pawn');
 	}
 $board->cur_color='B';
 $h=0;
 	$board->add_piece(0, $h, 'Rook');
 	$board->add_piece(1, $h, 'Knight');
 	$board->add_piece(2, $h, 'Bishop');
 	$board->add_piece(3, $h, 'Queen');
 	$board->add_piece(4, $h, 'King');
 	$board->add_piece(5, $h, 'Bishop');
 	$board->add_piece(6, $h, 'Knight');
 	$board->add_piece(7, $h, 'Rook');
 ++$h;
 	for($i=0;$i<8;++$i) {
 		$board->add_piece($i, $h, 'Pawn');
 	}
 ?><table border="1"><?php
 for($y=0;$y<8;++$y) {
 ?>
 	<tr>
 <?php
 	for($x=0;$x<8;++$x) {
 ?>		<td><?php echo $board->get_piece($x, $y); ?></td>
 <?php
 	}
 ?>	</tr><?php
 }
 ?>
 </table>
 
 </body>
 </html>