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af/form/previous_button_atts

Filter attributes on the previous button in multi-page forms. Use to add classes, set an ID, or add new attributes.

$attributes is an array of HTML attributes and their values.

<?php

function filter_previous_button_attributes( $attributes, $field ) {
    $attributes['class'] .= ' button';
    
    return $attributes;
}
add_filter( 'af/form/previous_button_atts', 'filter_previous_button_attributes', 10, 2 );