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Edit File: export-csv.php

<?php
/**
 * CFDB7 csv
 */

if (!defined( 'ABSPATH')) exit;

class CFDB7_Export_CSV{

/**
     * Download csv file
     * @param  String $filename
     * @return file
     */
    public function download_send_headers( $filename ) {
        // disable caching
        $now = gmdate("D, d M Y H:i:s");
        header("Expires: Tue, 03 Jul 2001 06:00:00 GMT");
        header("Cache-Control: max-age=0, no-cache, must-revalidate, proxy-revalidate");
        header("Last-Modified: {$now} GMT");
		
        header("Content-Type: text/csv; charset=UTF-8");
        header("Content-Disposition: attachment;filename={$filename}");

// disposition / encoding on response body
		header("Content-Disposition: attachment;filename={$filename}");
        header("Content-Transfer-Encoding: binary");

}
    /**
     * Convert array to csv format
     * @param  array  &$array
     * @return file csv format
     */
    public function array2csv(array &$array, $df){

if (count($array) == 0) {
            return null;
        }

$array_keys = array_keys($array);
        $heading    = array();
        $unwanted   = array('cfdb7_file', 'cfdb7_', 'your-');
        $delimiter  = apply_filters('cfdb7_csv_delimiter', ',');

foreach ( $array_keys as $aKeys ) {
            if( $aKeys == 'form_date' ) $aKeys = 'Date';
            if( $aKeys == 'form_id' ) $aKeys = 'Id';
            $tmp       = str_replace( $unwanted, '', $aKeys );
            $tmp       = str_replace( array('-','_'), ' ', $tmp );
            $heading[] = ucwords( $tmp );
        }

fputs( $df, ( chr(0xEF) . chr(0xBB) . chr(0xBF) ) ); 
        fputcsv( $df, $heading, $delimiter);

foreach ( $array['form_id'] as $line => $form_id ) {
            $line_values = array();
            foreach($array_keys as $array_key ) {
                $val = isset( $array[ $array_key ][ $line ] ) ? $array[ $array_key ][ $line ] : '';
                $line_values[ $array_key ] = $val;
            }
            fputcsv($df, $line_values, $delimiter);
        }
    }
    /**
     * Download file
     * @return csv file
     */
    public function download_csv_file(){

global $wpdb;
        $cfdb        = apply_filters( 'cfdb7_database', $wpdb );
        $table_name  = $cfdb->prefix.'db7_forms';

if( isset($_REQUEST['csv']) && isset( $_REQUEST['nonce'] ) ){

$nonce =  $_REQUEST['nonce'];
            if ( ! wp_verify_nonce( $nonce, 'dnonce')) {

wp_die( 'Not Valid.. Download nonce..!! ' );
            }
            $fid         = (int)$_REQUEST['fid'];
            $heading_row = $cfdb->get_results("SELECT form_id, form_value, form_date FROM $table_name
                WHERE form_post_id = '$fid' ORDER BY form_id DESC LIMIT 1",OBJECT);

$heading_row    = reset( $heading_row );
            $heading_row    = unserialize( $heading_row->form_value, ['allowed_classes' => false] );
            $heading_key    = array_keys( $heading_row );
            $rm_underscore  = apply_filters('cfdb7_remove_underscore_data', true);

$total_rows  = $cfdb->get_var("SELECT COUNT(*) FROM $table_name WHERE form_post_id = '$fid' "); 
            $per_query    = 1000;
            $total_query  = ( $total_rows / $per_query );

$this->download_send_headers( "cfdb7-" . date("Y-m-d") . ".csv" );
            $df = fopen("php://output", 'w');
            ob_start();

for( $p = 0; $p <= $total_query; $p++ ){

$offset  = $p * $per_query;
                $results = $cfdb->get_results("SELECT form_id, form_value, form_date FROM $table_name
                WHERE form_post_id = '$fid' ORDER BY form_id DESC  LIMIT $offset, $per_query",OBJECT);
                
                $data  = array();
                $i     = 0;
                foreach ($results as $result) :
                    
                    $i++;
                    $data['form_id'][$i]    = $result->form_id;
                    $data['form_date'][$i]  = $result->form_date;
                    $resultTmp              = unserialize( $result->form_value, ['allowed_classes' => false] );
                    $upload_dir             = wp_upload_dir();
                    $cfdb7_dir_url          = $upload_dir['baseurl'].'/cfdb7_uploads';

foreach ($resultTmp as $key => $value):
                        $matches = array();

if ( ! in_array( $key, $heading_key ) ) continue;
                        if( $rm_underscore ) preg_match('/^_.*$/m', $key, $matches);
                        if( ! empty($matches[0]) ) continue;

$value = str_replace( 
                                    array('&quot;','&#039;','&#047;','&#092;'),
                                    array('"',"'",'/','\\'), $value 
                                );

if (strpos($key, 'cfdb7_file') !== false ){
                            $data[$key][$i] = empty( $value ) ? '' : $cfdb7_dir_url.'/'.$value;
                            continue;
                        }
                        if ( is_array($value) ){

$data[$key][$i] = implode(', ', $value);
                            continue;
                        }
                        $data[$key][$i] = $value;
                        $data[$key][$i] = $this->escape_data( $data[$key][$i] );

endforeach;

echo $this->array2csv( $data, $df );

}
            echo ob_get_clean();
            fclose( $df );
            die();
        }
    }

/**
    * Escape a string to be used in a CSV context
    * @param string $data CSV field to escape.
    * @return string    
    */
    public function escape_data( $data ) {
		$active_content_triggers = array( '=', '+', '-', '@', ';' );

if ( in_array( mb_substr( $data, 0, 1 ), $active_content_triggers, true ) ) {
			$data = '"'. $data.'"';
		}

return $data;
	}
}

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