PHP Chess Game Coding

[aarti789]

Well, I am creating a PHP program (code and project reference taking from here) for making chess game but it shows some error at the time of its execution.  

Here is the source code: 

<?php
// Define chessboard array
$chessboard = array(
    array("R", "N", "B", "Q", "K", "B", "N", "R"),
    array("P", "P", "P", "P", "P", "P", "P", "P"),
    array("", "", "", "", "", "", "", ""),
    array("", "", "", "", "", "", "", ""),
    array("", "", "", "", "", "", "", ""),
    array("", "", "", "", "", "", "", ""),
    array("p", "p", "p", "p", "p", "p", "p", "p"),
    array("r", "n", "b", "q", "k", "b", "n", "r"),
);

// Display chessboard
echo "<table>";
for ($row = 0; $row < 8; $row++) {
    echo "<tr>";
    for ($col = 0; $col < 8; $col++) {
        $piece = $chessboard[$row][$col];
        echo "<td>" . $piece . "</td>";
    }
    echo "</tr>";
}
echo "</table>";

// Sample move validation (simplified)
function isValidMove($startRow, $startCol, $endRow, $endCol, $chessboard) {
    // Implement move validation logic here
    return true; // For demonstration purposes
}

// Sample game loop (simplified)
$player = "white";
while (true) {
    // Display current player's turn
    echo "<p>{$player}'s turn</p>";
    
    // Get move input from the user
    $startRow = /* user input */;
    $startCol = /* user input */;
    $endRow = /* user input */;
    $endCol = /* user input */;
    
    // Validate and apply the move
    if (isValidMove($startRow, $startCol, $endRow, $endCol, $chessboard)) {
        // Update the chessboard and switch players
        $chessboard[$endRow][$endCol] = $chessboard[$startRow][$startCol];
        $chessboard[$startRow][$startCol] = "";
        $player = ($player === "white") ? "black" : "white";
    } else {
        // Invalid move, display error message
        echo "<p>Invalid move!</p>";
    }
}
?>
<?php
// Define chessboard array
$chessboard = array(
    array("R", "N", "B", "Q", "K", "B", "N", "R"),
    array("P", "P", "P", "P", "P", "P", "P", "P"),
    array("", "", "", "", "", "", "", ""),
    array("", "", "", "", "", "", "", ""),
    array("", "", "", "", "", "", "", ""),
    array("", "", "", "", "", "", "", ""),
    array("p", "p", "p", "p", "p", "p", "p", "p"),
    array("r", "n", "b", "q", "k", "b", "n", "r"),
);

// Display chessboard
echo "<table>";
for ($row = 0; $row < 8; $row++) {
    echo "<tr>";
    for ($col = 0; $col < 8; $col++) {
        $piece = $chessboard[$row][$col];
        echo "<td>" . $piece . "</td>";
    }
    echo "</tr>";
}
echo "</table>";

// Sample move validation (simplified)
function isValidMove($startRow, $startCol, $endRow, $endCol, $chessboard) {
    // Implement move validation logic here
    return true; // For demonstration purposes
}

// Sample game loop (simplified)
$player = "white";
while (true) {
    // Display current player's turn
    echo "<p>{$player}'s turn</p>";
    
    // Get move input from the user
    $startRow = /* user input */;
    $startCol = /* user input */;
    $endRow = /* user input */;
    $endCol = /* user input */;
    
    // Validate and apply the move
    if (isValidMove($startRow, $startCol, $endRow, $endCol, $chessboard)) {
        // Update the chessboard and switch players
        $chessboard[$endRow][$endCol] = $chessboard[$startRow][$startCol];
        $chessboard[$startRow][$startCol] = "";
        $player = ($player === "white") ? "black" : "white";
    } else {
        // Invalid move, display error message
        echo "<p>Invalid move!</p>";
    }
}
?>

Can anyone give their suggestions on this.

Thanks

 

[Strider64]

Personally, if I were writing a chess game I would use JavaScript and Canvas not PHP for the main coding part of the game.

[ginerjm]

You say 'it shows some error'.  Care to pass along the exact error message?

[aarti789]

@Strider64 thanks a lot for your suggestions, definetely I will talk about it to my mates. 

Well, it shows some logical error at the time of its execution. 

Thanks  

 

[ginerjm]

Two weeks later and you still can't show us the error message or describe the problem?