Add note that only file rules can be used to validate files

[dgvirtual]

Also add explanation regarding rule uploaded, that it makes the file upload required.

[kenjis]

I don't get well "prevend all rules for the from file from being processed during validation."

[kenjis]

How about this?

Suggested change

	Therefore, adding any general rules, like ``permit_empy``, to file validation rules array or string will prevend all rules for the
	from file from being processed during validation.
	Therefore, if you add any general rules, like ``permit_empy`` to file validation rules array or string,
	the file validation will not work correctly.

[dgvirtual]

Well, if you set rules 'permit_empty|max_size[profile_img,1024]|mime_in[profile_img,image/jpeg]', you can uplood 3mb pdf's, and validation will pass.

[dgvirtual]

Yep, but I cannot believe I messed up my English that much... sorry.

Should be:

general rules, like permit_empy, to file validation rules array or string will prevent all rules for the file form field from being processed during validation (thus validating even invalid files).

[kenjis]

permit_empty (or other general rules) checks $_POST array, and the field for the file upload does not exist, so the validation passes.
However, most rules do not permit empty, and $_POST has no field for it, so if set, the validation will fail.

I don't know how to explain it briefly.

[dgvirtual]

Ah, it's complicated. I was also thinking about filing a bug report (it is not good that adding a stray rule disables the other rules), but now I suspect that it is more of a limitation of validation than a bug...

[kenjis]

How about this?

Suggested change

	Therefore, adding any general rules, like ``permit_empy``, to file validation rules array or string will prevend all rules for the
	from file from being processed during validation.
	Rules for General Use like ``permit_empty`` do not check the uploaded file (in the ``$_FILES`` superglobal),
	therefore, adding these rules to file validation rules array or string will not yield the expected results.

[sammyskills]

A rule typo:

Suggested change

	Therefore, adding any general rules, like ``permit_empy``, to file validation rules array or string will prevend all rules for the
	Therefore, adding any general rules, like ``permit_empty``, to file validation rules array or string will prevend all rules for the

[kenjis]

/github/workspace/user_guide_src/source/libraries/validation.rst:977: ERROR: Malformed table.

Text in column margin in table line 6.

======================= ========== ============================================= ===================================================
Rule                    Parameter  Description                                   Example
======================= ========== ============================================= ===================================================
uploaded                Yes         Fails if the name of the parameter does not  ``uploaded[field_name]``
                                    match the name of any uploaded files.
                                    If you want the file upload to be optional (not required),
                                    do not define this rule.

max_size                Yes         Fails if the uploaded file named in the      ``max_size[field_name,2048]``
looking for now-outdated files... none found
                                    parameter is larger than the second
                                    parameter in kilobytes (kb). Or if the file
                                    is larger than allowed maximum size declared
                                    in php.ini config file -
                                    ``upload_max_filesize`` directive.
max_dims                Yes         Fails if the maximum width and height of an  ``max_dims[field_name,300,150]``
                                    uploaded image exceed values. The first
                                    parameter is the field name. The second is
                                    the width, and the third is the height. Will
                                    also fail if the file cannot be determined
                                    to be an image.
mime_in                 Yes         Fails if the file's mime type is not one     ``mime_in[field_name,image/png,image/jpeg]``
                                    listed in the parameters.
ext_in                  Yes         Fails if the file's extension is not one     ``ext_in[field_name,png,jpg,gif]``
                                    listed in the parameters.
is_image                Yes         Fails if the file cannot be determined to be ``is_image[field_name]``
                                    an image based on the mime type.
======================= ========== ============================================= ===================================================

https://github.com/codeigniter4/CodeIgniter4/actions/runs/6407584328/job/17394669739?pr=7969

[dgvirtual]

Yep, see that now, will fix later today.

[kenjis]

Thank you!

There is a typo.