我们可以用PHP减少图像文件大小吗？

Question

Can we reduce an image file size with PHP if it exceed the the limit set by upload_max_filesize?

For instance, the upload_max_filesize at my serve is only 3MB, but the image file size for uploading is 4MB, so can I reduce 4MB to 3MB via some PHP function?

Or any other scripting programme can do this (I don't mean using Photoshop to reduce the file size)?

Answer 1

No - it's impossible for PHP to ever get hold of that file if it is too big.

You would have to use client-size resizing, which is possible using Flash- or Java-based uploaders:

• Compress images on client side before uploading
• Image resizing client-side with javascript before upload to the server