Untitled

<html>
	<head>
		<style>
		table {

			width:400px;
			height:400px;
		}

		</style>
	</head>
		<body>
<?php
echo "<table border=1>";
$k=9;
$n=9;
for($i=0;$i<$k;$i++)
	{
	 	if($i%2!=0)echo "<tr style='background-color: lightgrey;'>";
		else "<tr>";
		for($j=0;$j<$n;$j++)
		{
		if($j%2!=0 && $i%2==0) echo "<td style='background-color:lightgrey'></td>";
		 else if($j%2!=0 && $i%2!=0)echo "<td style='background-color:grey'></td>";
		 else echo "<td></td>";

		}
		echo "</tr>";
	}
	echo "</table>";
?>
		</body>
</html>