<style type="text/css">
table td{ width:30px; height:30px;}
table tr:nth-child(1) td:nth-child(1){ background-color:red;}
table tr:nth-child(1) td:nth-child(2){ background-color:yellow;}
table tr:nth-child(1) td:nth-child(3){ background-color:blue;}
table tr:nth-child(2) td:nth-child(1){ background-color:green;}
table tr:nth-child(2) td:nth-child(2){ background-color:white;}
table tr:nth-child(2) td:nth-child(3){ background-color:gray;}
table tr:nth-child(3) td:nth-child(1){ background-color:black;}
table tr:nth-child(3) td:nth-child(2){ background-color:orange;}
table tr:nth-child(3) td:nth-child(3){ background-color:purple;}
</style>

<?php

$str = <<<table
	<table>
		<tr>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td></td>
			<td></td>
			<td></td>
		</tr>
	</table>	
table;
echo $str;