PHP resize image fixed size but maintain orientation

Question

I need to resize images in php using GD to a fixed size but maintain the orientation (portrait/landscape), these are:

portrait: 375 x 500px landscape: 500 x 375px

Everything I have tried always ignores the orientation and makes them all landscape.

Can anyone help?

Answer 1

Check the width and height of the incoming image. If the width is wider than the height, make your target size 500 x 375, otherwise make it 375 x 500. Then run the resize code with those target dimensions.

Answer 2

Here is a method from an image class I use that calculates the scaled dimensions of an image. It works by fitting an image into a square box.

You can set $box = 500 and then pass the $x and $y of the image you are trying to resize and it will always return the correct resized dimensions maintaining the aspect ratio.

public static function fit_box($box = 200, $x = 100, $y = 100)
{
  $scale = min($box / $x, $box / $y, 1);
  return array(round($x * $scale, 0), round($y * $scale, 0));
}