将二进制JPEG图像数据加载到PHP变量中以进行MD5哈希处理

Question

I am writing a PHP script to verify that the JPEG data in two files are identical. The EXIF/IPTC (metadata) may change between the two files.

My general approach is to use an MD5 hash to compare the binary JPEG data of the two files to confirm it's unchanged.

However, no matter what I do using GD, I seem to be getting an MD5 hash of BOTH the metadata and JPEG data. Does anyone know the best method to extract just the image data from a JPEG file using PHP?

Thanks in advance...

Answer 1

@jarek.d above suggested using mogrify (part of imagemagick), so I am using exec to strip the metadata before comparing the two files. This works well.