如何将500k图像从单个目录分隔到多个？

I do have 500k images in one directory. Name of these images are stored in MySQL database. I want to divide this 500k images into 10k each directories. like 10k images in img01, another 10k images in img02,..etc. How can I do this with a PHP program?? does any one can help me with a sample code so I can modify it??

Thanks in advance

I will just show a pseudo-code approach, and if you are still stuck you can show what you tried and where you are stuck.

Select all images

Loop through the result

  if cntr mod 10k == 0 then 
    make new directory 
  else 
    use last directory

  Move the file to the new directory.

end loop

Then loop through each directory, updating the location in your database.

Now, another approach is to read everything in, then do the update in the loop, depending on memory availability.