How To Export Custom Posts and Metabox To CSV

function admin_post_list_add_export_button( $which ) {
    global $typenow;
    if ( 'shaform_db' === $typenow && 'top' === $which ) { ?>
        <input type="submit" name="export_all_posts" class="button button-primary" value="<?php _e('Export All Submissions'); ?>" />
        <?php
    }
}
add_action( 'manage_posts_extra_tablenav', 'admin_post_list_add_export_button', 20, 1 );

  function func_export_all_posts() {
    if(isset($_GET['export_all_posts'])) {
        $arg = array(
            'post_type' => 'shaform_db',
            'post_status' => 'publish',
            'posts_per_page' => -1,
        );  
    global $current_user, $product, $wp_session, $post;

    $arr_post = get_posts($arg);
    if ($arr_post) {

        header('Content-type: text/csv');
        header('Content-Disposition: attachment; filename="wp-posts.csv"');
        header('Pragma: no-cache');
        header('Expires: 0');

        $file = fopen('php://output', 'w');

        fputcsv($file, array('Full Name', 'Email', 'Phone', 'City', 'Postal Code', 'Appointment Date', 'Date', 'How did you hear about us?','Preferred Showroom', 'Street Address', 'Interested in', 'Number of Rooms', 'Comments', 'Image URL', 'Item Name', 'Item URL'));

        foreach ($arr_post as $post) {
            setup_postdata($post);

            /*$categories = get_the_category();
            $cats = array();
            if (!empty($categories)) {
                foreach ( $categories as $category ) {
                    $cats[] = $category->name;
                }
            }

            $post_tags = get_the_tags();
            $tags = array();
            if (!empty($post_tags)) {
                foreach ($post_tags as $tag) {
                    $tags[] = $tag->name;
                }
            }*/

        global $current_user, $product, $wp_session, $post;

        $p_data = get_post_meta( get_the_ID(),  "_quote_items", true );

        $ptitle = array();
        $purl = array();
        $pimg = array();

        foreach ($p_data as $quote) {

            $product_id = $quote['pid'];
            $quantity   = $quote['quantity'];
            $product   = wc_get_product( $product_id );
            $item_data = array();
            $var_data  = array();
            $str       = '?';

            if (!empty($quote['vari_id'])) {

                $variation   = wc_get_product($quote['vari_id']);
                $pro_title   = $variation->get_title();
                $p_title     = explode('(', $variation->get_formatted_name());
                $pro_title   = $p_title[0];
                $product_url = $variation->get_permalink();
                $pro_image   = $variation->get_image();
                $thumbnail = wp_get_attachment_image_src( get_post_thumbnail_id( $product_id ), array(100,100) );

            } else {
                $pro_title   = $product->get_title();
                $product_url = $product->get_permalink();
                $pro_image   = $product->get_image();
                $thumbnail = wp_get_attachment_image_src( get_post_thumbnail_id( $product_id ), array(100,100) );
            }

            $ptitle[] = $pro_title;
            $purl[] = $product_url;
            $pimg[] = $thumbnail[0];

        }   // end foreach


            $c1 = get_post_meta( get_the_ID(),  "_your_custom_1", true );
            $c2 = get_post_meta( get_the_ID(),  "_your_custom_2", true );
            $c3 = get_post_meta( get_the_ID(),  "_your_custom_3", true );
            $c4 = get_post_meta( get_the_ID(),  "_your_custom_4", true );
            $c5 = get_post_meta( get_the_ID(),  "_your_custom_5", true );
            $c6 = get_post_meta( get_the_ID(),  "_your_custom_6", true );
            $c7 = get_post_meta( get_the_ID(),  "_your_custom_7", true );
            $c8 = get_post_meta( get_the_ID(),  "_your_custom_8", true );
            $c9 = get_post_meta( get_the_ID(),  "_your_custom_9", true );
            $c10 = get_post_meta( get_the_ID(),  "_your_custom_10", true );
            $c11 = get_post_meta( get_the_ID(),  "_your_custom_11", true );
            $c12 = get_post_meta( get_the_ID(),  "_your_custom_12", true );
            $c13 = get_post_meta( get_the_ID(),  "_your_custom_13", true );

            //fputcsv($file, array(get_the_title(), get_the_permalink(), implode(",", $cats), implode(",", $tags)));

            fputcsv($file, array($c1, $c2, $c3, $c4, $c5, $c6, $c7, $c8, $c9, $c10, $c11, $c12, $c13, implode(",", $pimg), implode(",", $ptitle), implode(",", $purl)));
        }

        exit();
    }
}
}
add_action( 'init', 'func_export_all_posts' );

global $post, $product, $woocommerce, $wp_session;
									
// Insert the post into the database
$post_id = wp_insert_post(array (
'post_type' => 'shaform_db',
'post_title' => 'SHA Form ('.$lval.') - ' . date( 'Y-m-d H:i:s' ),
'post_content' => $comments,
'post_status' => 'publish',
'comment_status' => 'closed',
'ping_status' => 'closed',
'meta_input' => array(
'_your_custom_1' => $fullname, 
'_your_custom_2' => $email,
'_your_custom_3' => $phone,
'_your_custom_4' => $city,
'_your_custom_5' => $zipcode,
'_your_custom_6' => $date,
'_your_custom_7' => $send_date,
'_your_custom_8' => $hearabout,
'_your_custom_9' => $lval,
'_your_custom_10' => $address,
'_your_custom_11' => $totalFlooringType,
'_your_custom_12' => $NumberOfRooms,
'_your_custom_13' => $comments,
),));
									
if ( ! empty( $_POST['meta_input'] ) ) {
foreach ( $_POST['meta_input'] as $field => $value ) {
update_post_meta( $post_id, $field, $value );
}
}
									
$s_data = array();
$s_data = WC()->session->get( 'quotes' );
//echo $post_id;
update_post_meta( $post_id,  "_quote_items", $s_data );