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I put a if(is_home()) bit in my theme's functions.php and it doesn't seem to work. The function containing this bit is called on init so is_home should work already.

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Thanx for tags! – naugtur Aug 23 '10 at 10:06
up vote 8 down vote accepted

is_home() won't work until wp_query is run. The earliest hook you can use where is_home will work is 'parse_query', but 'template_redirect' would be better.

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Technically, 'parse_query' runs before 'wp' and is the absolute earliest you can check for is_home() with any certainty. – John P Bloch Aug 19 '10 at 15:03
wp() is called after init, so template_redirect is the first hook, for more options and a better view, see: toolpress.de/… – hakre Aug 19 '10 at 15:08
You misunderstood me, hakre. 'parse_query' and 'wp' are action hooks too, and that's what I was referencing. – John P Bloch Aug 19 '10 at 16:47
oh, no, not at all. I just wanted to underline what you wrote. I think your answer is just totally right. – hakre Aug 20 '10 at 9:54

To follow up on John's answer: Add a call to said function on one of the hooks mentioned by John and hakre.

Add, e.g., the following to your functions.php:

function my_function_name(){
  if(is_home()) do_something();

add_action('template_redirect', 'my_function_name');

EDIT: I misread your question at first -- it looks like you've got a function encapsulating the code already, it's just that you're firing on the wrong hook. Either break that section out into a separate function and have it fire at template_redirect, etc., or change where you're hooking in the first place.

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