Question

I run a ecommerce site, and I have tons of product images. The naming rules are simple: productid-picnumber.

但有时还存在差距。

4519年产品图例:

4519-0.jpg
4519-3.jpg
4519-4.jpg
4519-5.jpg
4519-8.jpg

I m trying to write an algorithm to rename the pictures. The pictures from this product should be renamed like this:

4519-0.jpg
4519-1.jpg
4519-2.jpg
4519-3.jpg
4519-4.jpg

In order. 0 must always be 0, as it s the main product image. -0 is always there. Let s say $ids is an array containing all my product ids.

Is looping through the product ids and using file_exists() the best way?

Answer 1

I highly suggest you that you get all filenames from a directory listing first, and then run the renaming "dry" (map oldname -> new name for the files to change) and then output if the actual result of the operation is the expected result.

This will not only save you much file_exists checks but also keeps things more safely.

Additionally you can think of using some standard file-system utilities which can rename/renumber files quite quickly. Check your OS documentation.

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