display the custom field text in e-tickets

I can not view the data in the e-tickets that are inserted into the custom field that you have added in your cart, do not you?

<?php
if ( ! defined( ‘ABSPATH’ ) ) {
exit;
} // Exit if accessed directly

/*
* Add custom fields easily by creating an array attached to the filter mt_custom_fields. For more control, define your own functions attached to these actions/filters.
*
* Example minimal usage:

add_filter( ‘mt_custom_fields’, ‘create_custom_fields’, 10, 2 );
function create_custom_fields( $array ) {
// Other fields: sanitize callback; input type; input values; display_callback
$array[‘test_event_data’] = array(
‘title’=>”Test Event Data”,
‘sanitize_callback’=>’my_sanitize_callback’,
‘display_callback’=>’my_display_callback’,
‘input_type’=>’text’, // most HTML5 or standard inputs supported
‘input_values’=>”, // single value required for checkbox or radio; array of values for select
‘context’=>’global’ // or event ID or array of event IDs; use filter mt_apply_custom_field_rules to apply custom rules
);
return $array;
}

function display_callback( $data, $context ) {
return urldecode( $data );
}

function sanitize_callback( $data ) {
return esc_sql( $data );
}
*/

add_filter( ‘mt_cart_custom_fields’, ‘my_custom_fields’, 10, 3 );
function my_custom_fields( $custom_fields, $cart, $gateway ) {
$custom_fields[‘tag’] = ‘<p class=”tag”><label for=”tag”>Codice Fiscale</label> <input type=”text” name=”tag” id=”tag” /></p>’;

return $custom_fields;
}

add_filter( ‘mt_handle_custom_cart_data’, ‘my_save_custom_field’, 10, 2 );
function my_save_custom_field( $payment, $post ) {
update_post_meta( $payment, ‘_tag’, $_POST[‘tag’] );

}

add_filter( ‘mt_custom_tickets_fields’, ‘mt_custom_tickets_fields’, 10, 4 );
function my_show_custom_field( $output, $post_ID ) {
$tag = get_post_meta( $post_ID, ‘_tag’, true );

return $output . $tag;
}

add_filter( ‘mt_notifications_data’, ‘my_custom_notification’, 10, 2 );
function my_custom_notification( $data, $details ) {
$tag = get_post_meta( $post_ID, ‘_tag’, true );

return $data;
}

add_action( ‘init’, ‘mt_add_actions’ );
function mt_add_actions() {
// adds field to Add to Cart form
add_filter( ‘mt_add_to_cart_fields’, ‘mt_custom_field’, 10, 2 );
// Save field data to cookie/user meta for use in cart
add_action( ‘mt_add_to_cart_ajax_field_handler’, ‘mt_handle_custom_field’, 10, 2 );
// Display field data in shopping cart
add_filter( ‘mt_show_in_cart_fields’, ‘mt_show_custom_field’, 10, 2 );
// Insert submitted data into Payment post meta
add_action( ‘mt_save_payment_fields’, ‘mt_insert_custom_field’, 10, 3 );
// Display field data on payment post.
// eliminate mt_show_in_payment_fields in favor of custom tickets fields
//add_filter( ‘mt_show_in_payment_fields’, ‘mt_show_payment_field’, 10, 2 );
// Display field data in tickets list.
add_filter( ‘mt_custom_tickets_fields’, ‘mt_custom_tickets_fields’, 10, 4 );
}

function mt_custom_tickets_fields( $output, $event_id, $payment_id, $sep ) {
$custom_fields = apply_filters( ‘mt_custom_fields’, array(), ‘tickets’ );
$return = ”;
$last_value = ”;
foreach ( $custom_fields as $name => $field ) {
$data = get_post_meta( $payment_id, $name );
$return = apply_filters( ‘mt_custom_ticket_display_field’, ”, $data, $name, $payment_id );
if ( ! empty( $data ) && $return == ” ) {

foreach ( $data as $d ) {
if ( ! isset( $field[‘display_callback’] ) ) {
$display_value = stripslashes( $d[ $name ] );
} else {
$display_value = call_user_func( $field[‘display_callback’], $d[ $name ], ‘payment’ );
}

if ( $display_value != ” && $d[ ‘event_id’ ] == $event_id ) {
$added_value = $field[‘title’] . ‘ – ‘ . $display_value;
if ( $added_value == $last_value ) {
continue;
} else {
$add_value = apply_filters( ‘mt_custom_ticket_format_output’, $added_value . $sep, $payment_id, $name );
$output .= $add_value;
$last_value = $added_value;
}
}
}
}
}

return $output . $return;
}

/**
* Check whether defined custom ticket fields should be shown on a given event.
*
* @param $field array
* @param $event_id integer
*
* @return bool|mixed|void
*/
function mt_apply_custom_field( $field, $event_id ) {
if ( ! isset( $field[‘context’] ) || $field[‘context’] == ‘global’ ) {
return true;
}
if ( is_numeric( $field[‘context’] ) && (int) $field[‘context’] == $event_id ) {
return true;
}
if ( is_array( $field[‘context’] ) && in_array( $event_id, $field[‘context’] ) ) {
return true;
}

// add your custom rules.
return apply_filters( ‘mt_apply_custom_field_rules’, false, $field, $event_id );
}

/**
* Process array of custom field definitions to return output HTML.
*
* @param $fields array
* @param $event_id integer
*
* @return string
*/
function mt_custom_field( $fields, $event_id ) {
$custom_fields = apply_filters( ‘mt_custom_fields’, array(), ‘input’ );
$output = ”;
foreach ( $custom_fields as $name => $field ) {
$continue = mt_apply_custom_field( $field, $event_id );
if ( $continue ) {
$user_value = esc_attr( stripslashes( mt_get_data( $name . ‘_’ . $event_id ) ) );
switch ( $field[‘input_type’] ) {
case “text”:
case “number”:
case “email”:
case “url”:
case “date”:
case “tel”:
$output = “<input type='” . $field[‘input_type’] . “‘ name=’$name’ id=’$name’ value=’$user_value’ />”;
break;
case “textarea”:
$output = “<textarea rows=’6′ cols=’60’ name=’$name’ id=’$name’>$user_value</textarea>”;
break;
case “select”:
if ( isset( $field[‘input_values’] ) ) {
$output = “<select name=’$name’ id=’$name’>”;
foreach ( $field[‘input_values’] as $value ) {
$value = esc_attr( stripslashes( $value ) );
if ( $value == $user_value ) {
$selected = ” selected=’selected'”;
} else {
$selected = ”;
}
$output .= “<option value='” . esc_attr( stripslashes( $value ) ) . “‘$selected>” . $value . “</option>\n”;
}
$output .= “</select>”;
}
break;
case “checkbox”:
case “radio”:
if ( isset( $field[‘input_values’] ) ) {
$value = $field[‘input_values’];
if ( $user_value != ” ) {
$checked = ‘ checked=”checked”‘;
} else {
$checked = ”;
}
$output = “<input type='” . $field[‘input_type’] . “‘ name=’$name’ id=’$name’ value='” . esc_attr( stripslashes( $value ) ) . “‘$checked />”;
}
break;
default:
$output = “<input type=’text’ name=’$name’ id=’$name’ value=’$user_value’ />”;
}
$fields .= “<p><label for=’$name’>” . $field[‘title’] . “</label> ” . $output . “</p>”;
}
}

return $fields;
}

/**
* Call user functions to sanitize and save custom data with current user’s shopping cart.
*
* @param $submit array
*/
function mt_handle_custom_field( $saved, $submit ) {
$custom_fields = apply_filters( ‘mt_custom_fields’, array(), ‘sanitize’ );
foreach ( $custom_fields as $name => $field ) {
if ( isset( $submit[ $name ] ) ) {
if ( ! isset( $field[‘sanitize_callback’] ) || ( isset( $field[‘sanitize_callback’] ) && !function_exists( $field[‘sanitize_callback’] ) ) ) {
// if no sanitization is provided, we’ll prep it for SQL and strip tags.
$sanitized = esc_sql( strip_tags( urldecode( $submit[ $name ] ) ) );
} else {
$sanitized = call_user_func( $field[‘sanitize_callback’], urldecode( $submit[ $name ] ) );
}
$event_id = $submit[‘mt_event_id’];
mt_save_data( $sanitized, $name . ‘_’ . $event_id );
}
}
return $saved;
}

/**
* Display saved data in shopping cart and add hidden input field to pass into payment creation.
*
* @param $content string
* @param $event_id integer
*
* @return string
*/
function mt_show_custom_field( $content, $event_id ) {
$custom_fields = apply_filters( ‘mt_custom_fields’, array(), ‘display’ );
foreach ( $custom_fields as $name => $field ) {
$data = mt_get_data( $name . ‘_’ . $event_id );
if ( ! isset( $field[‘display_callback’] ) || ( isset( $field[‘display_callback’] ) && !function_exists( $field[‘display_callback’] ) ) ) {
$display_value = stripslashes( $data );
} else {
$display_value = call_user_func( $field[‘display_callback’], $data, ‘cart’ );
}
$content .= $display_value . “<input type=’hidden’ name='{$name}[$event_id]’ value='” . esc_attr( $data ) . “‘ />”;
}

return $content;
}

/**
* Insert post meta data into payment field.
*
* @param integer $payment_id
* @param array $post
* @param array $purchased
*/
function mt_insert_custom_field( $payment_id, $post, $purchased ) {
$custom_fields = apply_filters( ‘mt_custom_fields’, array(), ‘save’ );
foreach ( $custom_fields as $name => $field ) {
if ( isset( $post[ $name ] ) ) {
foreach ( $post[ $name ] as $key => $data ) {
if ( $data != ” ) {
$data = array( ‘event_id’ => $key, $name => $data );
add_post_meta( $payment_id, $name, $data );
}
}
}
}
}

/**
* Display custom field in payment post manager.
*
* @param $content string
* @param $payment_id integer
*
* @return string
*/
function mt_show_payment_field( $content, $payment_id ) {
$custom_fields = apply_filters( ‘mt_custom_fields’, array(), ‘admin’ );
$output = ”;
foreach ( $custom_fields as $name => $field ) {
$data = get_post_meta( $payment_id, $name );
$return = apply_filters( ‘mt_custom_display_field’, ”, $data, $name );
if ( $return === ” ) {
foreach ( $data as $d ) {
if ( ! isset( $field[‘display_callback’] ) ) {
$display_value = stripslashes( $d[ $name ] );
} else {
$display_value = call_user_func( $field[‘display_callback’], $d[ $name ], ‘payment’ );
}
if ( $display_value != ” ) {
$event_title = get_the_title( $d[‘event_id’] );
$output .= apply_filters( ‘mt_custom_data_format_output’, “<p>$event_title:<br />$field[title] – $display_value</p>”, $payment_id, $name );
}
}
} else {
$output .= $return;
}
}

return $content . $output;
}

/**
* Display custom field on tickets/receipts
*
* @param $payment_id integer
* @param $custom_field string|boolean
*
* @return string
*/
function mt_show_custom_data( $payment_id, $custom_field = false ) {
$custom_fields = apply_filters( ‘mt_custom_fields’, array(), ‘receipt’ );
$output = ”;
foreach ( $custom_fields as $name => $field ) {
if ( $custom_field == false || $custom_field == $name ) {
$data = get_post_meta( $payment_id, $name );
$return = apply_filters( ‘mt_custom_display_field’, ”, $data, $name );
if ( $return === ” ) {
foreach ( $data as $d ) {
if ( ! isset( $field[‘display_callback’] ) ) {
$display_value = stripslashes( $d[ $name ] );
} else {
$display_value = call_user_func( $field[‘display_callback’], $d[ $name ], ‘payment’ );
}
if ( $display_value != ” ) {
$event_title = get_the_title( $d[‘event_id’] );
$output .= apply_filters( ‘mt_custom_data_format_output’, “<p>$event_title:<br />$field[title] – $display_value</p>”, $payment_id, $custom_field );
}
}
} else {
$output .= $return;
}
}
}

return $output;
}