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

Last update on May 30 2022 11:45:01 (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
      for($row=1;$row<=8;$row++)
	  {
          echo "<tr>";
          for($col=1;$col<=8;$col++)
		  {
          $total=$row+$col;
          if($total%2==0)
		  {
          echo "<td height=30px width=30px bgcolor=#FFFFFF></td>";
          }
		  else
		  {
          echo "<td height=30px width=30px bgcolor=#000000></td>";
          }
          }
          echo "</tr>";
    }
          ?>
  </table>
  </body>
  </html>

View the output in the browser

Flowchart:

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Previous: Write a PHP script that creates the specific table using for loops. Add cellpadding="3px" and cellspacing="0px" to the table tag.
Next: Write a PHP script that creates the specific table (use for loops).

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC