图像mime类型因我使用的PHP Server而异

Question

I have this image file that when I test in my local environment then PHP determines it is of type

image/jpeg

However that same code and same image on my server gets detected as

application/octet-stream

What could be causing this behavior?

Image Size: 2.31 MB 
Name: ^EC91F66F648FD45E7BF3BE9D2169E239D41E49B794EA71E326^pimgpsh_fullsize_distr (1).jpg

Local Environment

PHP: 5.6.15

Live Environment

PHP: 5.6.9

Answer 1

The issue is likely due to a difference with the mime magic file. This file contains sequences that help detect which mime type a file is by reading the first few bytes.

The fileinfo class, which is being used with your methods, can be given a path to the magic file, otherwise it has a process of searching for a mime magic file.

If you want to set a specific magic file you can add this setting to your php.ini mime_magic.magicfile .