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1. jumpbug
   Member
   Posted 3 years ago #

   So, I've got a hook declared already, I'm trying to add a function call to that hook, and pass a variable:
   add_action('wp_hook_sidebar', 'displayAd($passedtext)');

   then i've got the function:
   function displayAd($passedText)
   {
   echo $passedText;
   }

   The text doesn't get passed to the function though. I know that's not the way it works based on a couple of previous threads I found:
   http://wordpress.org/support/topic/155337
   and
   http://wordpress.org/support/topic/166587

   But, neither of those threads provide an answer. Anybody got a clue how I can get that variable passed? This is driving me nuts

2. Roger Theriault
   Member
   Posted 3 years ago #

   Sorry, it doesn't work that way.

   All WP really does is save your function name and then call it when do_action('wp_hook_sidebar') is called. Your displayAd function is going to have to get what it needs on its own - from a global variable, a function call, a SQL query, etc...

   Try

   global $passedtext;
   $passedtext = 'foo';

   and elsewhere ...

   add_action('wp_hook_sidebar','displayAd');
   
   function displayAd() {
       global $passedtext;
   
       echo $passedtext;
   }

   However, if $passedtext is available in the code that calls do_action() then you CAN pass it (but your example is odd or misleading, why bother if you can just echo it anyway.) However, if your displayAd function is doing a bit more, you can do this:
   

   do_action('my_hook',$myparameter, $secondparameter);

   and then
   

   add_action('my_hook', 'my_function');
   function my_function( $param1, $param2 ) {
   ...
   }

   Of course if you're dealing with an existing WordPress hook, you can only use parameters if it will be passing them, since the add_action has already been inserted into the code. Check here for details:
   http://adambrown.info/p/wp_hooks
   or just open up the core php file that you're hooking into.

   (And for other options to get stuff to your function, grab a handy PHP book.)

3. Roger Theriault
   Member
   Posted 3 years ago #

   (Correction - I meant to say the do_action has already been inserted)

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