Answered thanks to Milo’s comment.
I wrote a small function to check if the query variable exists. Note that get_query_var('listen')
didn’t work for me.
function is_listen() {
$vars = $GLOBALS['wp_query']->query_vars;
if ( array_key_exists('listen', $vars) ) {
return true;
} else {
return false;
}
}
Use it in a conditional like so:
if ( is_listen() ) {
// Display listen tab
}
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