It really depends on your implementation. and your example seems wrong. You 
need on add_action( 'wp_head', 'some_function' );
Inside that function is your code.

Marko


Op 18 dec. 2012, om 19:14 heeft "Philip M. Hofer \(Frumph\)" 
<[email protected]> het volgende geschreven:

> Is there a way to fire add_action on a function that happens multiple times ?
> 
> usage, for example is adding a meta tag to wp_head each and every post that 
> is displayed
> 
> 
> -----Original Message----- From: Marko Heijnen
> Sent: Tuesday, December 18, 2012 10:07 AM
> To: [email protected]
> Subject: Re: [wp-testers] add_action anonymous function
> 
> The use of an anonymous function is bad code practice and I removed that part 
> of the codex. Another reason it required PHP 5.3
> 
> The reason it fails it probably due an old PHP version.
> 
> Marko
> 
> 
> Op 18 dec. 2012, om 18:59 heeft Léonard Wüst <[email protected]> het 
> volgende geschreven:
> 
>> bitte meine adresse löschen danke
>> 
>> 2012/12/18 Philip M. Hofer (Frumph) <[email protected]>
>> 
>>> Taken from the add_action codex http://codex.wordpress.org/**
>>> Function_Reference/add_action#**Simple_Hook<http://codex.wordpress.org/Function_Reference/add_action#Simple_Hook>
>>> 
>>> add_action('wp_head', function() { echo 'something';})
>>> 
>>> is supposed to work, it just makes my site die
>>> 
>>> 
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>>> 
>> 
>> 
>> 
>> -- 
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