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I'm trying to define the constant ACF_Lite as true so that the interface of the Advanced Custom Fields plugin is hidden on all of my multisite subsites except the parent. For clarity and maintainability, I'm wanting to do this from an mu-plugins plugin that will also control the fields displayed by that plugin.

I thought this would do it but it didn't:

if( get_current_blog_id() !== 1 )
    define( 'ACF_Lite', true );

The plugin author says that this needs to be in wp-config.php, but I'm surprised that this doesn't work because, according to the codex, mu-plugins are:

Loaded by PHP, in alphabetical order, before normal plugins,

I've confirmed that get_current_blog_id() returns the right ID, so that's not the problem. I've also tried explicitly hooking that to muplugins_loaded and plugins_loaded but that has failed.

Can anyone explain why I can't define this from mu-plugins?

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  • Put var_dump(defined('ACF_Lite')) in your mu-plugin. Is it already defined?
    – s_ha_dum
    Commented Jun 6, 2013 at 20:39
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    Should not be defined before the plugin is loaded, see source
    – fuxia
    Commented Jun 6, 2013 at 20:40
  • The answer below solved my issue, but I want to make sure I understand @toscho's comment (upvote and all!). It seems to me that the whole point is to define the constant before the plugin is loaded so it doesn't display the UI.
    – mrwweb
    Commented Jun 6, 2013 at 22:58
  • @mrwweb I just pointed out the order was correct, didn’t see the lower case. :)
    – fuxia
    Commented Jun 7, 2013 at 6:29

1 Answer 1

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@toscho's link solved this. PHP constants are case sensitive.

ACF uses ACF_LITE, you are using ACF_Lite.

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