I recently started using imagemagick with php and I'm relatively new to both IM and PHP. So, I'm here to ask for help / suggestions.

First

If it can be said that the user uploads a gif or png image to my site, and I want it to be converted to jpg, are there any like, for example. $image->convert($file,'.jpg) or is the convert command available only through exec()? e.g. exec(convert picture.pngto picture.jpg)

Second

What should I do if the user uploads gif / png to the site again and I resize the image to the specified width / height and write the image with the writeImage IM function as follows: $image->writeImage(basename.$ext)where $ext= jpg. Will this work correctly, is this a good practice? I guess it will only rename it, but still, I don't see a problem in this ... oO

Sorry for another question, I'm not very familiar with exec, it is better to use imagemagick with help exec(), does it improve speed, loading, etc.