END ; for ($span = 100; $span > 0; $span -= 20) pair($span); function pair($width) { echo "
"; for ($h = $width; $h > 0; $h -= 0.5) { box(1,$h); } for ($h = 1; $h <= $width; $h += 0.5) { box(1,$h); } echo "
"; } function box($w, $h) { $w = (int)$w; //$h = (int)$h; echo "x"; }