Question

$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

How can i save the resized image to folder/ ?
And how can I detect the image type is jpg/png/gif?

Answer 1

To save the image to a file, you can use any of these: imagejpeg(), imagepng(), or imagegif(), depending on your desired output format.

To detect the image type, you can just check the file’s extension and base yourself on that. However, sometimes people manually change the extension of an image file, thinking that actually changes the image type, so it’s always a good idea to check whether imagecreatefrom returned an image resource rather than false.

For a quick way to return just the extension of a file:

$ext = pathinfo($path_to_file, PATHINFO_EXTENSION);

Manual entry on pathinfo()