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In wp-signup.php there are these lines:

add_action( 'wp_head', 'wpmu_signup_stylesheet' );

I need to remove wpmu_signup_stylesheet from the wp_head action, but I seem to be struggling, I assume it is because the action is being called straight after.

Here is what I've tried from a plugin:

// Called from an action that is added with:
// add_action('wp_head', array($this, 'remove_signup_style', 11));
remove_action( 'wp_head', 'wpmu_signup_stylesheet');
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up vote 4 down vote accepted

The action is not right after actually. There is get_header() call, then get_header action and then locating and loading template file that has wp_head() in it.

I try not to mess with removing things from inside of same hook you are at, so in this case I'd (ab)use that get_header action to hook function that will remove what you don't want from later wp_head.

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Many thanks, just changed the hook of the function that called remove_action to get_header. – Dunhamzzz Jul 22 '11 at 13:49

Thanks for the tip @Rarst! Working code below.

//Remove the css injected into wp_head for the wp-signup.php form
add_action('get_header', 'remove_wpmu_signup_styles');
function remove_wpmu_signup_styles () {
    remove_action('wp_head', 'wpmu_signup_stylesheet');
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Try adding a priority:

remove_action( 'wp_head', 'wpmu_signup_stylesheet', 11 );

p.s. is the add_action() call really placed before get_header(), or is it placed before wp_head()? I'm not sure it really matters, so long as wp_head() is included in header.php; but that's just an unusual place to add an add_action() call.

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The priority arg passed to remove_action() has to match the one from add_action(). – scribu Jul 22 '11 at 13:41
I always seem to forget that! :) – Chip Bennett Jul 22 '11 at 13:43
Yeah those two lines are exactly as that in wp-signup.php. As per the docs you can only remove an action if the priorty is the same, the weird thing is that remove_Action actually returns true yet the action is still being ran. – Dunhamzzz Jul 22 '11 at 13:47

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