Save image from one format to another with php gd2

Question

I have a database with a column filled with image binaries data. After I made some research I figuried out how to detect in which image format is the data. Lets say in of the re

Answer 1

If you only want to convert the image data to JPEG then all you need is imagecreatefromstring and imagejpeg. Basically:

imagejpeg(imagecreatefromstring($gif_bindata), "temp.jpeg");
$jpeg_bindata = file_get_contents("temp.jpeg");

It's that simple because imagecreatefromstring detects the file type automatically (the first few bytes contain enough magic bytes to make detection feasible). And obviously you might want to use a real temporary filename instead.