WP Advanced Search: Default value for taxonomy field

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I’m using a WP Advanced Search to search for custom posts. It contains 4 fields, one to search the post’s title, two other to limit search results to specific meta data, and another one to limit results to a specific custom taxonomy: 

[...]
$args['fields'][] = array('type' => 'taxonomy',
'label' => __('Discipline:', CORE_THEME_NAME),
'taxonomy' => 'course-discipline',
'format' => 'select',
'class' => 'searchselect',
'operator' => 'IN');
[...]

What I want to do now, is to add an empty default selection option for the taxonomy at the top. Does anyone know how to do that in the most simple way?

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1 comment

  1. Exemplo!

    $args['fields'][] = array(
    'allow_null' => 'Mês',
    'type' => 'date',
    'date_type' => 'month',
    'format' => 'select',
);

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