Let's say I want to change the max upload limit for a Wordpress website and I give the following values:
wp-config.php: 128MB php.ini: 256MB .htaccess: 64MB
So, which one would Wordpress prioritize while processing upon need?
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It's not clear from your question what you are changing in each of these files, but I presume in each case it is the
upload_max_filesize PHP setting.
In general, settings will be applied in this order, each over-riding the previous value:
However, this setting is defined as
PHP_INI_PERDIR, which as explained on this page means it cannot be set using
ini_set, so the
wp-config.php cannot change it. So in the example you give in the question, it will take the value from .htaccess of 64MB.
You can verify this by running
echo ini_get('upload_max_filesize'); somewhere in your code.
Note that there are other places values can be set which I haven't listed above, such as per-user php.ini files, and other Apache configuration contexts. Also, some of these can be disabled, so if your server is not set to allow over-rides in .htaccess, you won't be able to set a value there either.
Also note that Wordpress includes some of its own configuration variables, which interact in different ways with the PHP configuration. For instance,
WP_MEMORY_LIMIT will attempt to raise the PHP
memory_limit setting at startup, but has code which checks and never lowers it. There's no general rule to this, it will be different for different settings.
Basically all three files are taken into consideration.
WordPress/your server will check in the following order:
wp-config.php > .htaccess > php.ini
If something on a "higher level" (later in the chain) is limiting your value, the former value will be ignored or overwritten. If a piece of the chain is missing, the value in
.htaccess for example, the next higher one will be used instead.
In your example the
.htaccess would limit the
max_upload_size to 64 MB, although your server would be fine with up to 256 MB and WordPress would also accept up to 128 MB in file size first.
You can also set a different limit via the
.htaccess file and by doing this you overwrite the value from
php.ini, so that it is no longer the dominating value. This works in a lot of hosting environments, so chances are quite good you can raise or lower the
max_upload_size in this way.
If you have a more strictly configured hosting/server, it is possible that the option to override the settings from
php.ini is disabled. In this case, overriding
.htaccess won´t work, so this could be a limiting factor.
I think flomei should edit the answer, because that is the right answer but bad explaination.
Php.ini -> .htaccess -> wp-config.php is actually the order each file will be read and will set the values taking consideration that there is not setting previously defined.
But in the case there is a previously defined setting, this will be "over-ridden" only if the new setting is lower.
That means, if you have wp-config.php with 64Mb and .htaccess with 32 MB: wp-config.php won't override that setting because there is already a lower limit and you will end up with 32Mb.
But if you have wp-config.php with 32Mb and .htaccess with 64 MB, wp-config.php will lower the previous setting to 32Mb.
Edit: To clarify, as IMSoP points out, wp-config.php just lets you set a size that's more restrictive than what the PHP settings allow if you are changing 'WP_MEMORY_LIMIT', it doesn't let you go beyond that. So it's not actually a settings override. In fact, there are separated checks done at different points at runtime. If you are changing the php setting
upload_max_filesize as he assumes (the question doesn't indicate which settings are you changing), that has no effect.
Also, you will have to take into account that the
post_max_size must be greater than
upload_max_filesize in your php settings