Can we reduce an image file size with php?

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, you can't. If the file size exceeds upload_max_filesize, PHP will just refuse the upload, so you have no opportunity to resize it.

Answer 2

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

Answer 3

arnaud is correct. However, if you are able to change the upload_max_filesize, you could increase it and then resize any file that exceeds the max desired size using gd.

Answer 4

If you can use .htaccess file, put this:

php_value upload_max_filesize 4194288
php_value post_max_size 4194288

4194288 = 4MB