My pretty permalink clearly shows the query_var:
localhost/site/?tree=312
Yet when I run
var_dump(get_query_var('tree'));
I get NULL returned.
Any reason why? Also when I print_r($wp_query), I can't find 'tree' anywhere.
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well first, that isn't a pretty permalink, it's a query string argument. what is tree? is it a registered query var?– MiloSep 27, 2012 at 15:54
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@Milo - I'm elaborating on the url. It's more like localhost/site/category/?tree=312. I added the query_arg when I displayed the link: add_query_arg('tree',$post->ID,get_permalink($post->ID)); I'm basically passing the ID in the URL and I thought I'd give it a name of 'tree'.– AlxVallejoSep 27, 2012 at 15:56
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I guess I'm suppose to register it, huh?– AlxVallejoSep 27, 2012 at 15:58
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yes, see my answer.– MiloSep 27, 2012 at 15:59
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ps. not 'elaborating' but the opposite of that :)– AlxVallejoSep 27, 2012 at 16:10
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1 Answer
You have to add any query vars that are not WordPress objects to the array of recognized query vars to be able to retrieve it from the $wp_query global:
add_filter( 'query_vars', 'wpa66452_query_vars' );
function wpa66452_query_vars( $query_vars ){
$query_vars[] = 'tree';
return $query_vars;
}
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Would it be more efficient to run global $wp; $wp >add_query_var('tree'); ? Sep 27, 2012 at 16:03
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no difference in efficiency, but the filter is the proper way to add them– MiloSep 27, 2012 at 17:33
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Note: I had the same issue, add_filter fixed it but I also had to declare my $page variable below get_header() Feb 7, 2017 at 0:00