if($toWH<=$srcWH){$ftoW=$toW;$ftoH=$ftoW*($srcH/$srcW); }else{$ftoH=$toH;$ftoW=$ftoH*($srcW/$srcH); }

$ftoH=$toH;$ftoW=$toW;if ($toWH<=$srcWH) {$src_Y = 0;$src_X = ($srcW-$srcH*$toWH)/2; $srcW = $srcH*$toWH;} else {$src_X = 0;$src_Y = ($srcH-$srcW/$toWH)/2; $srcH = $srcW/$toWH;}