迴圈設計 - 三層迴圈設計

rgb (0,0,0) rgb (0,0,51) rgb (0,0,102) rgb (0,0,153) rgb (0,0,204) rgb (0,0,255)
rgb (0,51,0) rgb (0,51,51) rgb (0,51,102) rgb (0,51,153) rgb (0,51,204) rgb (0,51,255)
rgb (0,102,0) rgb (0,102,51) rgb (0,102,102) rgb (0,102,153) rgb (0,102,204) rgb (0,102,255)
rgb (0,153,0) rgb (0,153,51) rgb (0,153,102) rgb (0,153,153) rgb (0,153,204) rgb (0,153,255)
rgb (0,204,0) rgb (0,204,51) rgb (0,204,102) rgb (0,204,153) rgb (0,204,204) rgb (0,204,255)
rgb (0,255,0) rgb (0,255,51) rgb (0,255,102) rgb (0,255,153) rgb (0,255,204) rgb (0,255,255)
rgb (51,0,0) rgb (51,0,51) rgb (51,0,102) rgb (51,0,153) rgb (51,0,204) rgb (51,0,255)
rgb (51,51,0) rgb (51,51,51) rgb (51,51,102) rgb (51,51,153) rgb (51,51,204) rgb (51,51,255)
rgb (51,102,0) rgb (51,102,51) rgb (51,102,102) rgb (51,102,153) rgb (51,102,204) rgb (51,102,255)
rgb (51,153,0) rgb (51,153,51) rgb (51,153,102) rgb (51,153,153) rgb (51,153,204) rgb (51,153,255)
rgb (51,204,0) rgb (51,204,51) rgb (51,204,102) rgb (51,204,153) rgb (51,204,204) rgb (51,204,255)
rgb (51,255,0) rgb (51,255,51) rgb (51,255,102) rgb (51,255,153) rgb (51,255,204) rgb (51,255,255)
rgb (102,0,0) rgb (102,0,51) rgb (102,0,102) rgb (102,0,153) rgb (102,0,204) rgb (102,0,255)
rgb (102,51,0) rgb (102,51,51) rgb (102,51,102) rgb (102,51,153) rgb (102,51,204) rgb (102,51,255)
rgb (102,102,0) rgb (102,102,51) rgb (102,102,102) rgb (102,102,153) rgb (102,102,204) rgb (102,102,255)
rgb (102,153,0) rgb (102,153,51) rgb (102,153,102) rgb (102,153,153) rgb (102,153,204) rgb (102,153,255)
rgb (102,204,0) rgb (102,204,51) rgb (102,204,102) rgb (102,204,153) rgb (102,204,204) rgb (102,204,255)
rgb (102,255,0) rgb (102,255,51) rgb (102,255,102) rgb (102,255,153) rgb (102,255,204) rgb (102,255,255)
rgb (153,0,0) rgb (153,0,51) rgb (153,0,102) rgb (153,0,153) rgb (153,0,204) rgb (153,0,255)
rgb (153,51,0) rgb (153,51,51) rgb (153,51,102) rgb (153,51,153) rgb (153,51,204) rgb (153,51,255)
rgb (153,102,0) rgb (153,102,51) rgb (153,102,102) rgb (153,102,153) rgb (153,102,204) rgb (153,102,255)
rgb (153,153,0) rgb (153,153,51) rgb (153,153,102) rgb (153,153,153) rgb (153,153,204) rgb (153,153,255)
rgb (153,204,0) rgb (153,204,51) rgb (153,204,102) rgb (153,204,153) rgb (153,204,204) rgb (153,204,255)
rgb (153,255,0) rgb (153,255,51) rgb (153,255,102) rgb (153,255,153) rgb (153,255,204) rgb (153,255,255)
rgb (204,0,0) rgb (204,0,51) rgb (204,0,102) rgb (204,0,153) rgb (204,0,204) rgb (204,0,255)
rgb (204,51,0) rgb (204,51,51) rgb (204,51,102) rgb (204,51,153) rgb (204,51,204) rgb (204,51,255)
rgb (204,102,0) rgb (204,102,51) rgb (204,102,102) rgb (204,102,153) rgb (204,102,204) rgb (204,102,255)
rgb (204,153,0) rgb (204,153,51) rgb (204,153,102) rgb (204,153,153) rgb (204,153,204) rgb (204,153,255)
rgb (204,204,0) rgb (204,204,51) rgb (204,204,102) rgb (204,204,153) rgb (204,204,204) rgb (204,204,255)
rgb (204,255,0) rgb (204,255,51) rgb (204,255,102) rgb (204,255,153) rgb (204,255,204) rgb (204,255,255)
rgb (255,0,0) rgb (255,0,51) rgb (255,0,102) rgb (255,0,153) rgb (255,0,204) rgb (255,0,255)
rgb (255,51,0) rgb (255,51,51) rgb (255,51,102) rgb (255,51,153) rgb (255,51,204) rgb (255,51,255)
rgb (255,102,0) rgb (255,102,51) rgb (255,102,102) rgb (255,102,153) rgb (255,102,204) rgb (255,102,255)
rgb (255,153,0) rgb (255,153,51) rgb (255,153,102) rgb (255,153,153) rgb (255,153,204) rgb (255,153,255)
rgb (255,204,0) rgb (255,204,51) rgb (255,204,102) rgb (255,204,153) rgb (255,204,204) rgb (255,204,255)
rgb (255,255,0) rgb (255,255,51) rgb (255,255,102) rgb (255,255,153) rgb (255,255,204) rgb (255,255,255)
<?php
	for ( $i=0; $i<=5; $i++) {
		$r = $i*51;
		$rr = 255 - $r;
		echo "<tr>";
		for ( $j=0; $j<=5; $j++ ){
			$g = $j*51;
			$gg = 255 - $g;
			echo "<tr>";
			for ( $y=0; $y<=5; $y++ ){
				$b = $y*51;
				$bb = 255- $b;
				echo "<td style='background-color:rgb($r,$g,$b); color:rgb($rr,$gg,$bb);'>rgb ($r,$g,$b)</td>\n" ;
			}
		}
	}
	echo "</tr>";
?>