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Edit File: Total.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * Class NF_Field_Total
 */
class NF_Fields_Total extends NF_Abstracts_Input
{
    protected $_name = 'total';

protected $_section = '';

protected $_icon = 'money';

protected $_aliases = array();

protected $_type = 'total';

protected $_templates = 'total';

protected $_test_value = '0.00';

protected $_settings_exclude = array( 'placeholder', 'default', 'input_limit_set', 'disable_input', 'required' );

public function __construct()
    {
        parent::__construct();

$this->_nicename = esc_html__( 'Total', 'ninja-forms' );
    }

public function process( $total, $data )
    {
        $subtotal = 0;

foreach( $data[ 'fields' ] as $key => $field ){

if( isset ( $field[ 'type' ] ) && 'shipping' == $field[ 'type' ] ){
                $subtotal += (float)$field[ 'shipping_cost' ];
            }
        }

if( isset( $data[ 'product_totals' ] ) ){

foreach( $data[ 'product_totals' ] as $product_total ){

$subtotal += (float)$product_total;
            }
        }

$data[ 'new_total' ] = number_format( $subtotal, 2 );

return $data;
    }
}

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