anspress-category-field-override.php

<?php
/**
 * Override AnsPress form category field selection list.
 * 
 * @param mixed $form 
 * @return mixed 
 */
function anspress_override_category_field( $form ){
    $form['fields']['category'] = array(
        'label'    => __( 'Category', 'anspress-question-answer' ),
        'desc'     => __( 'Select a topic that best fits your question.', 'anspress-question-answer' ),
        'type'     => 'select',
        'options'  => 'terms',
        'order'    => 2,
        'validate' => 'required,not_zero',
        'terms_args' => array(
            ''
        )
    );

    return $form;
}
add_action( 'ap_question_form_fields', 'anspress_override_category_field', 99999 );