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All 16777215 displayable colors in a webpage.<?$fp = fopen("colors.html","w");fwrite($fp, "<table>");for ($i=0;$i<=16777215;) {fwrite($fp, '<tr>');for ($j=0;$j<=255;) {fwrite($fp, '<td bgcolor="'.str_pad(dechex($i),6, "0", STR_PAD_LEFT).'"><font color="#FFFFFF">'.str_pad(dechex($i),6, "0", STR_PAD_LEFT).'</font> <font color="#000000">'.str_pad(dechex($i),6, "0", STR_PAD_LEFT).'</font></td>');  $j++;  $i++;}fwrite($fp, '</tr>');}fwrite($fp, "</table>");?>