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I need to generate a simple error message on a page by passing a variable through the URL.

The URL is structured as follows:

http://site.com/parent-category/category/?error=pause

I'm sure it's the permalinks rewrite interfering, but I'm not sure how to resolve it.

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You need to know you to generate using $_GET variable, or how to add query args in url? –  Mamaduka Feb 6 '12 at 17:18
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2 Answers

up vote 5 down vote accepted

Try adding the variable to the WordPress' array of 'recognised query variables'...

add_filter('query_vars', 'my_register_query_vars' );
function my_register_query_vars( $qvars ){
    //Add query variable to $qvars array
    $qvars[] = 'my_error';
    return $qvars;
}

Then the value of 'my_error' can be found via get_query_var('my_error'). (See Codex)

EDIT

From Otto's comment, it's better to do:

add_action('init','add_my_error');
function add_my_error() { 
    global $wp; 
    $wp->add_query_var('my_error'); 
}
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Exactly what I needed, thanks! –  Kyle Feb 6 '12 at 17:24
    
I wouldn't use that filter in particular. We have functions that you should use for that instead. add_action('init','add_my_error'); function add_my_error() { global $wp; $wp->add_query_var('my_error'); } –  Otto Feb 6 '12 at 20:49
    
Thanks @Otto - I've added your comment to the answer. –  Stephen Harris Feb 6 '12 at 20:58
    
Cool. It doesn't really matter, actually, I just prefer to not use deep hooks when shallow ones will do the job. :) –  Otto Feb 6 '12 at 21:01
    
I always use add_rewrite_tag($tagname,$regex). Any difference? –  Rob Vermeer Feb 6 '12 at 21:10
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This was the only way I could get this to work

add_action('init','add_query_args');
function add_query_args()
{ 
    add_query_arg( 'error', 'pause' );
}

http://codex.wordpress.org/Function_Reference/add_query_arg

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