PHP for loop Exercises : Create a chess board using for loop

Last update on March 11 2024 10:29:09 (UTC/GMT +8 hours)

PHP for loop: Exercise-9 with Solution

Write a PHP script using nested for loop that creates a chess board as shown below.

Use table width="270px" and take 30px as cell height and width.

Sample Solution:

PHP Code:

<!DOCTYPE html>
<html> 
<head> 
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body> 
<h3>Chess Board using Nested For Loop</h3>
<table width="270px" cellspacing="0px" cellpadding="0px" border="1px">
<!-- cell 270px wide (8 columns x 60px) -->
<?php
// Outer loop for rows
for($row=1; $row<=8; $row++)
{
    echo "<tr>"; // Start a new table row
    
    // Inner loop for columns
    for($col=1; $col<=8; $col++)
    {
        // Calculate total sum of row and column indices
        $total = $row + $col;
        
        // Check if total is even or odd to determine cell color
        if($total % 2 == 0)
        {
            // If total is even, set cell background color to white
            echo "<td height=30px width=30px bgcolor=#FFFFFF></td>";
        }
        else
        {
            // If total is odd, set cell background color to black
            echo "<td height=30px width=30px bgcolor=#000000></td>";
        }
    }
    
    echo "</tr>"; // End the table row
}
?>
</table>
</body>
</html>

Output:

View the output in the browser

Explanation:

In the exercise above,

The code begins with an HTML structure, including a doctype declaration (<!DOCTYPE html>), opening <html>, <head>, and <body> tags.
Inside the <body> section, there's an <h3> heading stating "Chess Board using Nested For Loop".
Following the heading, a table is created with a fixed width of 270 pixels (width="270px") and the border attributes set.
PHP code is embedded within the HTML to generate the chessboard pattern.
The PHP code starts with an outer "for" loop (for($row=1; $row<=8; $row++)) to iterate through the rows of the chessboard.
Inside the outer loop, there's an inner for loop (for($col=1; $col<=8; $col++)) to iterate through the columns of each row.
Within the inner loop, the code calculates the sum of the row and column indices ($total = $row + $col).
Based on whether the sum is even or odd (if($total % 2 == 0)), the background color of the cell is set to white or black respectively.
The HTML table cells (<td>) with the appropriate background colors are echoed out within the loop.
After completing a row, the code echoes out </tr> to close the row.
After both loops are complete, the PHP code ends, and the HTML structure is closed with closing tags (</table>, </body>, </html>).

Flowchart:

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