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; }